第九课 Lesson Nine 1.怎样听到声音 How to hear the sound 2.我们是怎样听到声音的？准备一些材料来研究吧！ How do we hear the sound? Prepare some materials to study! 3.我们是怎样听到声音的？ How do we hear the sound? 4.想一想。 Think about it. 5.声音传到人的耳朵里，耳朵又是怎样听到声音的？ How does the ear hear the sound when it reaches the ear? 6.耳朵的构造。 The structure of the ear. 7.外耳、中耳、内耳、听小骨、耳蜗、听神经、外耳道、鼓膜。 External ear, middle ear, inner ear, ossicle, cochlea, auditory nerve, external auditory canal, tympanic membrane. 8.耳朵分为外耳、中耳、内耳三部分。 The ear is divided into outer ear, middle ear and inner ear. 9.中耳和内耳在头的内部，我们看不见。 The middle and inner ears are inside the head, and we can't see them. 10.外耳由耳廓和外耳道组成。 The external ear consists of auricle and external auditory canal. 11.中耳由鼓膜、听小骨等构成。 The middle ear is composed of tympanic membrane and ossicles. 12.鼓膜是椭圓形的、半透明的薄膜。 The tympanic membrane is oval and translucent. 13.内耳由耳蜗等构成。 The inner ear is composed of cochlea, etc. 14.耳蜗与听神经相连。 The cochlea is connected to the auditory nerve. 15.探究耳朵的作用 Explore the role of the ear 16.由此推想，耳朵有什么作用？ What is the function of the ear? 17.声波通过外耳道传到鼓膜引起鼓膜振动，鼓膜的振动又通过听小骨传给耳蜗，连接耳蜗的听神经把声音信号报告给大脑，我们就听到声音了。 sound waves are transmitted to the tympanic membrane through the external auditory canal, causing the tympanic membrane to vibrate. The vibration of the tympanic membrane is transmitted to the cochlea through the auditory ossicles. The auditory nerve connecting the cochlea reports the sound signal to the brain, and we hear the sound. 18.怎样保护我们的耳朵呢？ How to protect our ears? 19.耳朵是人体的听觉器官，如果受到伤害，人的听力就会下降，甚至丧失。 The ear is the hearing organ of human body. If it is injured, people's hearing will decline or even lose. 20.保护听力要注意以下几点：一是尽量避开噪声，二是不要用尖锐的工具掏挖耳朵，以免戳伤外耳或鼓膜；三是听到巨大声响时要张口，以免震破鼓膜；四是鼻、咽发生炎症时，要及时治疗，避免引起中耳炎；五是不让污水进入外耳道，避免外耳道感染。 To protect hearing, we should pay attention to the following points: first, try to avoid noise; second, do not use sharp tools to dig the ear, so as not to stab the outer ear or tympanic membrane; Third, open your mouth when you hear a loud sound, so as not to break the eardrum; Fourth, when inflammation of nose and pharynx occurs, timely treatment should be taken to avoid otitis media; Fifthly, sewage should not be allowed to enter the external auditory canal to avoid external auditory canal infection. 21.哪些动物的耳廓很大很长？这对动物有什么作用？ Which animals have large and long auricles? What does this do to animals? 22.我们应怎样对待听力有障碍的人？ How should we treat people with hearing impairment? |
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