Sound is very close to us and is also the most common physical thing to come into contact with. I am afraid that there is no other thing that can appear so frequently in human life except light. There is a sound in both the rain and the wind, and even when it rains, there is a small sound. With mobile phones and televisions, we hear more. The sound here is both physical and literary. Imagine that the words spoken by the actor are not the thoughts of the screenwriter? We don't so much look at the actors as we look at the inner voice of the screenwriter. The key to an actor's acting skills is to be able to say cold lines with warmth and truly enter people's hearts. Some people always say that there are all kinds of problems with anti-Japanese dramas, logically. For example, the heroine of Anti-Japanese Wonder says that her grandfather was killed when she was eight years old. When we accuse the screenwriter of having problems with logical thinking, we might as well think about it, maybe he just wants to exaggerate the enemy's bad behavior. Li Bai said in the poem that the flying stream went straight down to 3,000 feet, and it was suspected that the Milky Way fell for nine days. Excuse me, what kind of waterfall did the author see? It's very gloomy, and this is extreme exaggeration.

In music, there is a high pitch. And there are also special tenors and sopranos, who are specially sung in the form of high notes. However, I think they use bel canto more. One of the characteristics of bel canto is that it is highly adhesive and sounds continuous. You might say that isn't it the same with the sound of speech? No, there are brief pauses when speaking. People often mishear the lyrics, just because people can't tell what sounds they are? When you encounter an unfamiliar language, you will feel that the voice of speech has a high degree of bonding. When you learn it, this feeling is greatly reduced. Even, disappear completely. The beauty of a song is that it makes you understand and not understand. What you can understand is the lyrics, and what you can't understand is the artistic conception. Why do you get bored of a passage in a new language that you listen to? Is that because you have no idea what the speaker is saying? Even though the adhesion of the pronunciation is high, it sounds good. However, it doesn't take long for you to give up. Some singers will occasionally sing a few words in a foreign language, but not the whole song. If people don't understand anything at all, your song basically doesn't have the motivation to listen to it.

Parrots imitate human speech, or pronunciation. The question is whether it really understands the specific meaning of each pronunciation. Is it possible to think about it here? Sometimes I think about things silently, but I don't think there's anything wrong with me. Actually, I think it's something to think about. However, the scope of thinking must be narrow. Just like a physics teacher, you don't necessarily know algebraic number theory. Math teachers don't necessarily understand fluid mechanics. Everyone has their own range of knowledge, and their thinking is within that range. Some people expand this range very quickly, while others do it quickly. Although parrots imitate the pronunciation of the word when it first says it, it will gradually understand it after a long time. It's like a dog, it doesn't understand you, but it can see what you do. Through your actions and behaviors, you can analyze and draw conclusions. Because of this, humans can communicate with dogs without words.

After the Earth rotates once, it returns to its original point. When you return to the original point, you will continue to rotate. Our discussion continues day by day, isn't it like the rotation of the earth? The Earth's rotation has cycles, and we should also have cycles when we discuss. And our cycle is known to everyone to be one day, and the discussion cycle is four people taking turns to speak. Then, the next step should be to follow the cycle. Water speaks.

Du is fourth, so I'll go first. We know that sound is generally made through vibrations, and I wanted to ask if only vibrations can make sounds? Rain makes a sound when it hits the wallcovering, and there doesn't seem to be a vibration here. Or that contact is a type of vibration. So, I have to ask, is there always a sound when two objects come into contact? Molecules are in constant motion, and the surface contact of two objects inevitably causes the molecules on their surfaces to collide, and it is strange that there is no sound in this case. So why haven't we heard? Or is there really a sound that people can't hear? Yes, there really is. When the sound frequency is below 20 Hz or above 20,000 Hz, it cannot be heard. So, is the sound here below 20 Hz or above 20,000 Hz? I think there are a lot of molecules, and there are a lot of surfaces. So, the vibration frequency must be high. Therefore, it cannot be below 20 Hz but above 20,000 Hz.

Playing chess is your next step, my next step. The discussion should also be what I said, and you just say it. This relay race of speeches needs you to continue. Du said.

In phonetics, there are two types of sounds: clean and voiced. In the encyclopedia, clean sound is the sound produced by the vocal cords without vibrating, while dullness is the sound produced by the vibration of the vocal cords. So, I have to ask where is that vibrating? I checked the encyclopedia, and there is a medical encyclopedia that says it is lung vibration. How do I want to relate to my lungs? There is a saying that a clean sound is aspirated, while a voiced sound is unaspirated. The lungs are where the air flows, so they naturally become the organs that vibrate and make sounds.

The oscillatory circle frequency is the free vibration equation, which is the homogeneous second-order equation. It is related to mass, while vibration frequency is related to amplitude. Essentially, they don't matter. Sixth.

Can vibration amplitude affect velocity amplitude? No, because the key physical quantities are different. So, is there a relationship between displacement amplitude and velocity amplitude? The amplitude of the displacement determines the displacement, whereas the amplitude of the velocity determines the velocity. In addition, the displacement is related to the velocity, so the velocity amplitude can affect the displacement amplitude.

Is the vibrational energy of the oscillator just kinetic energy. According to the vibrational energy formula, there is also potential energy, which some people may confuse with potential energy. However, there is a difference between them. As for the difference, let everyone find out for themselves.

I think the number of turns of the spring is related to the coefficient of elasticity. The lower the number of turns, the smaller the elastic coefficient. And the less elastic it is. Margarita said.

Solid particles have a solubility limit, and we have time to discuss them. Now that the time has come, we will follow the laws of nature and disperse.