To catch cicadas, do you need to keep your mouth shut?
Yuan Mei, a shepherd boy in qing Dynasty, riding a scalper, lingyue singing.Intending to catch cicadas, he suddenly stood silent.Cowboy boys riding on the backs of cattle, loud songs echoed in the forest.Suddenly want to catch the tree singing cicadas, immediately stop singing, silently standing beside the tree.The shepherd boy riding the ox, Lin yue singing.The first line of the poem starts without a trace.The second sentence suddenly rises and the melody quickens to a climax.One or two sentences describe the innocent and lively, carefree and lovely appearance of the little shepherd boy and his happy mood. The word “riding” directly describes the posture of the shepherd boy, and the word “vibration” indirectly points out his mood.Through “ride” and “vibration” two verbs, the shepherd boy’s carefree, carefree mood and set out.He was so absorbed in the beauty of nature that he hardly knew that sorrow existed.It was because of the joy in his heart that he couldn’t help singing and even saying “Xlingyue”.In physics, sound is caused by the vibration of objects, and the objects that are making sound are called sound sources.The shepherd boy was the source of the sound. Where did the shepherd boy’s song come from?The vocal cords in your throat vibrate.The faster the vocal cords vibrate, the higher the sound they produce;The slower the vocal cords vibrate, the lower the sound they produce.The greater the vibration of the vocal cords, the stronger the sound they produce;The less the vocal cords vibrate, the weaker the sound they produce.This is the change in the intensity of the voice.Yue: Referring to the shady trees beside the road.Why do songs vibrate in the forest?Because the sound is a pressure wave: when playing Musical Instruments, slapping a door or on the desktop, their vibration will cause medium – air molecules rhythmic vibration, make the air density change, forming density and longitudinal wave, this creates a sound wave, this phenomenon will continue to vibration disappeared.Similarly, when a shepherd boy sings aloud, the vibration of the sound causes a change in the density of the surrounding air, which affects the nearby trees.Intending to catch cicadas, he suddenly stood silent.Three or four sentences continue to describe the expression.The third sentence is the transition, is the posture.The psychological activities of the shepherd boy explain the reason for his “silence and standing”, which is also the turning point of the whole poem.The fourth sentence, a sudden turn down, like a thousand feet waterfall into a deep pool, stopped abruptly.The word “suddenly” vividly expresses the boy’s surprise and alertness when he finds cicadas chirping in the tree.”Suddenly” has changed: by the ring and quiet, by the line and stop, the little shepherd boy closed his mouth to pay attention to the moment of cicada expression written full of lasting appeal.The two verbs, “close” and “stand”, vividly depict the innocent manner and childlike wit of the shepherd boy.The whole poem pure use of line drawing technique, firmly grasp the performance of the little shepherd boy in a moment, lifelike write the characteristics of the little shepherd boy is very clever, let a person feel the pure and lovely little shepherd boy.The language of poetry, such as words, plain, very natural.As for the next step, how the little shepherd boy catches cicadas, whether he catches them or not, the poet does not write about it, leaving it to the readers to experience, reverie and ponder.The shepherd boy thought of catching cicadas because he heard them chirping.So how does the shepherd boy hear the cicadas?Let’s take a look at how cicadas make sounds.Cicadas use membrane vibration to produce sound, but only males produce sound.The lower part of the abdomen has a thin layer of vocal membrane, which is divided into two compartments, the large compartment has a pleated membrane and a mirror membrane, and the small compartment tympanum is located in the body.When the insect compartment tympanic membrane muscles contract, up to 10,000 times per second, causing the large compartment hair fold membrane and mirror membrane vibration, so as to give out a loud sound.So, how does a shepherd boy hear cicadas chirping?The sound of cicadas travels through the air to the shepherd boy’s ears.The process of hearing sound is first collected by the auricle. The sound is physical sound wave, which is collected through the auricle and transmitted through the external auditory canal to vibrate the eardrum.Behind the eardrum are three auditory ossicles, the three smallest bones in the human body, and this process is called conduction.The collection of the auricle is conducted through the external auditory canal to the eardrum, which together with the auditory ossicles can serve as an amplifier.The mechanical energy is transmitted to the cochlear window of the stirrup floor through the tympanic membrane and auditory ossicles through the acoustic vibration, and the fluid in the inner ear fills the cavity and drives the movement of the inner ear fluid when the stirrup is active.There are many hair cells in the structure of the inner ear. As the fluid fluctuates, the hair cells will swing, and then the mechanical energy will be converted into biological electrical energy, which will be transmitted to the central part through the cochlear nerve, and the central part will give feedback, which is a process of sound conduction.Does a shepherd boy’s silence affect cicadas?After careful study, entomologists found that cicadas have ears.His ears, however, are not on his head, but near the second segment of his abdomen, and consist of the eardrum, the chordal auditory buds, and the sensory cells above.Cicadas are not deaf, but their ears accept sound waves at a certain frequency range, and they cannot hear the sound waves at too high or too low a frequency.Cicadas are particularly sensitive to the same cicadas and are deaf to the sounds of people clapping, whistling, Shouting and even laying soil because the sound waves of these sounds are outside the frequency range of their ears.