"No, why didn't I understand? Second brother, I don't think the third brother understands, right? Hao Guangyin explained to Shu Shengtian concisely and concisely, and turned to find the third brother Wang Jiaozhun, but found that people had already run to take care of their sister Wang Jiaobei, who had just come down from the competition, and did not care about what principles were not principles, and methods were not methods.

"Okay, if you really want to make this question white, then I'll explain it clearly and well." Saying that, Shu Shengtian dragged Hao Guangyin to the side where the personnel were sparse and not very noisy.

"Brother Hao, I'm going to treat it as a point of knowledge, don't dislike me for nagging." After Shu Shengtian said this, he started his Xueba teaching mode with Hao Guangyin's sentence "How can I dislike you".

"First of all, shadow is an optical phenomenon, and shadow is not an entity, just a projection." After speaking, Shu Shengtian glanced at Hao Guangyin, and after receiving his nod feedback, he continued: "Because of the scientific principle that objects block light, there is the concept of shadows. Light rays propagate in a straight line in the same homogeneous medium, and cannot pass through the darker areas formed by impermeable objects, and the resulting projection is what we often call shadows. (In this case, the age of light refers to visible light.) ”

"Uh-huh," Hao Guangyin looked at Shu Shengtian and nodded seriously.

"When you hold up a glass of water in the sun, it casts a shadow of water on the ground that is darker than the surrounding but lighter than your body." Shu Shengtian continued.

"yes, I seem to be ...... I've seen this kind of scene, but I just didn't pay attention to it. Hao Guangyin echoed.

"Light is a particle, so when it encounters a water molecule, it will bounce back to a part, which is reflection. The increase in water temperature is due to the fact that the water absorbs some of the sun's light. Light can pass through and cast on the ground, which is why a shadow of water is cast on the ground that is darker than the surroundings, but lighter than your body. Shu Shengtian deliberately slowed down his speech in order to make Hao Guangyin understand.

"At the start of the race, it was theoretically really hard to see the scale in the distance. Although Hong Can has a tailwind ear, even if there is no enchantment suppression, this skill still can't help me get the information on the water gap. But two factors helped us. When Shu Shengtian said this, he deliberately paused, and he wanted to test Hao Guangyin.

"What about those two factors?" Hao Guangyin, who answered the question, immediately continued to ask: "Is it that the amount of water in the measuring cylinder must be enough for us to see the shadow clearly, if the amount of water is very small, the shadow is near the graduated cylinder, we still can't see it?" ”

"That's fine, but that's not the most important point. The most important point is the setting of the time of our game and the direction of the game. Shu Shengtian corrected.

"Oh? Tell me about it! "Hao Guangyin is in the spirit, if there is paper and pen beside him, he has the posture of taking out and taking notes.

"Our competition is early in the morning, when the sun is in the east, and our competition organizing committee has set up this east-west competition in order to facilitate more students to see the competition process clearly. The starting point is on the west side of the playground, and the end point is set on the east side of the playground. This caused the light to come from the east, shining on the graduated cylinder, and the shadow dragged to the ground. Shu Shengtian explained.

"Oh, those are the two factors you are talking about!" Hao Guangyin sounded pale.

"No, no, no, it's just one of those factors, it's the setting of the game." Shu Shengtian said.

"Oh? That...... And one more factor is ......?" Hao Guangyin can't wait to find out.

"Well, of course, every time a player rushes over, they pour new water into the cylinder, which causes the water in the cylinder to wave, and the cylinder to be stationary. The swaying of the water area on the natural ground is extra shady and makes it easier for me to calculate. In addition, the other party is ahead, so one second before Wang Jiaobei set off, I also waited until the moment when the opponent's water shadow was relatively static to determine, the water gap between our two sides, that is, it seems that although the speed of our previous players is not as good as that of the other party, the water transportation does lay a certain advantage for Wang Jiaobei of the last stick. Although in the end we didn't have as much water as the other team, don't forget, we traded a stick with zero water in exchange for the final game! It should be said that every member of the team is a hero! Shu Shengtian sighed sincerely.

"Isn't it you?" Saying that, Hao Guangyin patted Shu Shengtian on the shoulder.

Shu Shengtian did not shirk, and a long sentence of "cut-" showed his light and light feelings about his credit.

While the two were talking, Tang Hongcan, Wang Jiaozhun and Wang Jiaobei and the two brothers and sisters ran over together.

"You two just found a place to find you! You have to know the setting of the enchantment, my downwind ears can't be used, and you two will have to call my brother me next time you hide from it. Tang Hongcan pouted and complained.

"Whereever, whereever! I just don't know about an optical problem, so I'm just looking for a quieter place to ask your Xueba brother for advice. Hao Guangyin said with a smile, and hugged Tang Hongcan, who seemed to be aggrieved, as he spoke.

"Brother Hao, let's get down to business, there are four team events, and we only need to win three of them to succeed. However, because of the previous tug-of-war, we did not lose on the spot, which led to our next two competitions having to win in one fell swoop. Wang Jiaozhun had a hint of nervousness and anxiety in his words.

"yes. The next event is the 8×400m mixed relay race. There are a total of eight teams, and only the first place is considered a winner. Skills can't be used in the arena, and magic weapons can't be used. How can we make sure we win the championship? You have to think tactically. The fact that Shu Shengtian helped everyone win opened up Hao Guangyin's thoughts, and at this moment, his mind was also rapidly calculating tactics.

As the saying goes, a planned life is a blueprint. If you don't plan your life, it will be a puzzle.

"Check-in notice, check-in notice. Students participating in the 8×400m mixed track and field relay race in the first year of high school should go to the northeast corner of the stadium under the leadership of the sports committee of each class to check in at the northeast corner of the sports field. Broadcast again, the students who participated in the 8×400-meter mixed track and field relay race in the first year of high school......" The sound of the radio floating on the sports field once again sounded the clarion call for the charge in everyone's hearts.

Suddenly, Hao Guangyin's frowning brows suddenly relaxed. Hurriedly turned to the people around him and asked, "Will any of us participate in this event?" ”

"No, Brother Hao. Aren't we all going to participate in the last event? Let's rest on this. By the way, Guan Shanwen and Meng Xuande both participated in this event. Wang Jiaozhun replied.

Before Wang Jiaozhun could finish speaking, Hao Guangyin suddenly ran towards the check-in office.

"Brother Hao, Brother Hao!" Tang Hongcan just wanted to get up and chase after him.

"Leave me alone, I'll go find General Lu Chuan! Waiting for me in the seat! Hao Guangyin turned around and shouted and continued to run away.

"Then let's go to our seats and wait for him." Shu Shengtian proposed.

"Let's go to our seating area! I have to go to my brother Hao! Our brother Hao has no me, it's like instant noodles without a seasoning packet, understand? Saying that, Tang Hongcan still chased after Hao Guangyin in the direction that he ran away.