"Captain Chen, according to me, the Boeing series passenger planes of your civil aviation should fly at least 8,000 meters or more, right?"

"Mr. Wu is right, the normal cruising altitude of this series of civil aircraft is about 8,000 to 12,000 meters."

"That is to say, you are already flying above the maximum safe altitude, how can you still open the cabin and let those hijackers parachute to escape?"

"Mr. Wu, it's like this, before opening the hatch, Mr. Zhang had already ordered me to reduce the flight altitude and speed of the plane. When the plane descended to 3,000 meters, Mr. Zhang opened the hatch and let the guys parachute to escape. Of course, it is not enough to reduce the flight speed and altitude, and the pressure in the cabin must be depressurized at the same time, so that the pressure inside and outside the aircraft can be balanced before the cabin door can be opened. Chen Lei introduced.

"Oh, it's better to listen to your words than to read a book for ten years. Although I have been on so many planes, I have not understood so much knowledge related to airplane flying until today, thank you Captain Chen. ”

"Mr. Wu, you're welcome."

"Shirley, do you have any eating habits for Huaxia?" Wu Qianqian asked Shirley.

"Habit, today's food is so delicious, not only the color is good-looking, the taste is delicious, this aroma is also too good, Sister Wu, how to describe the aroma in Chinese?" Shirley asked.

"In Chinese, there are too many words to describe aroma, such as strong aroma, overflowing aroma, fragrant aroma, aromatic aroma, aromatic aroma, aroma striking and so on." Wu Qianqian introduced.

"Wow! An aroma can be described in so many beautiful four-word words? In contrast, English is much more monotonous? Shirley said in amazement.

"Although these words are beautiful, their parts of speech are different."

"Oh, Sister Wu, how can I not see any difference between them? Sister Wu, can you tell your sister-in-law? ”

"Of course. In order to learn Chinese well, in addition to learning the basic grammatical structure, it is also very important to master the parts of speech in Chinese. The parts of speech in Chinese are similar to those in English, and there are real words and virtual words......"

"Sister Wu, what are the real words in Chinese and what are the virtual words?" Shirley asked.

"Words in modern Chinese can be divided into two categories and 12 parts of speech. One category is real words: nouns, verbs, adjectives, numerals, quantifiers, and pronouns. One category is hypothetical: adverbs, prepositions, conjunctions, particles, onomatopoeia, and interjections. The beautiful writing of the Chinese language is mainly composed of these words with different parts of speech. ”

"Oh, no wonder Chinese is so broad and profound, so expressive, and so complicated." Shirley sighed.

"In fact, the same is true of English, and its word classification is also very complicated, such as: noun (noun), verb (verb), preposition (prep.), conjunctive (conj.), adjective (adj.), adverb (adverb), article (art.), number (num.), interjection (int.), pronoun (pron), etc., there should be more than 20 kinds."

"Sister Wu, when I was learning a language, I rarely paid attention to these complex grammar issues, not to mention that I was able to communicate with everyone, but I was always confused about some so-called grammar concepts, including my native language. For example, the words "fragrant" and "fragrant", I have never been able to understand the difference between them, in my opinion, they are both used to describe aroma, there is no difference. ”

"It's not hard to tell the difference. Just discern their parts of speech, and you're good to go. Like, for those two words, aroma is a noun, that's fine, right? And the key is the words 'rich' and 'tangy' in the back. 'Intense' is used to describe aroma, color, atmosphere, so the word should be an adjective. The 'flutter' in 'flutter' is a verb word that indicates an action, and 'flutter' here shows the movement of the aroma, so this word should be a verb. ”

"Oh, Sister Wu, can I understand it this way: 'Rich' describes a state of aroma, while pungence expresses a form of movement of aroma?"

"Verygood, Shirley, you're so right."

"Sister Wu, that is to say, the part of speech that overflows with fragrance should be the same as that of rich aroma, and the aroma is secretive, the aroma is attractive, and the aroma is the same as the aroma?" Shirley asked.

"Haha! Our Shirley is so smart. Yes, you get most of the parts of speech right, but you may be confused about the parts of speech of the words "fragrant" and "intense". Yi is both a verb and an adjective, but it cannot be used as an adjective here. ”

"Sister Wu, why?"

"Because the word 'overflowing' expresses the action of the aroma spreading around, just like a flood overflowing the embankment and flowing around. Therefore, this 'overflow' is a verb here, so it is the same as the fragrant part of speech. ”

"Wow! Sister Wu is too proficient in the grammar of the language. Shirley admired.