蝉发音的秘密蝉为么会发音，对我来说一直是个谜。
为了揭开这个秘密，我常常躲在树下悄悄地观察。
我发现蝉鸣时，总是“挺胸”、“翘尾”。
Why cicadas can pronounce has always been a mystery to me.
In order to uncover the secret, I often hide under the tree and observe it quietly.
I found that cicadas always "hold their chests up" and "raise their tails" when they chirp.
这是为什么呢？
一天，我捉到了一只蝉，进行了观察研究。
我摘掉了蝉的翅膀，把它放在地上，它在地上扑打着小翅膀，叫着；我又折断了它针状式的嘴，可它仍然叫着。
蝉究竟靠什么发音呢？
经过反复观察，我发现这声音好像是从遥发出来的。
于是，我把它捉起来看，发现它凹部的两侧，各有一片鱼鳞似的硬壳，像钳甲一样，里面有一对透明薄膜。
蝉呜时，簿膜地回动，我用手轻轻地一扞这个地方，蝉就叫了。
我不停地捏，它就不停地叫。
我想：这对簿膜就是它发音器吧！
我把簿膜刺破，再怎么捏，它也不叫了。
后来妈妈告诉我这是蝉的“响板”，是雄蝉特殊发音器。
发音膜的肌遥收缩振动，蝉就会发出声音。
雌蝉没有“响板”，所以是哑巴。
Why is that?
One day, I caught a cicada and made an observation.
I took off the wings of the cicada and put it on the ground.
It flapped its little wings on the ground and cried.
I broke its needle like mouth again, but it still cried.
What pronunciation does cicada depend on?
After repeated observation, I found that the sound seemed to come from the chest.
So I caught it up and saw that on both sides of its concave, there was a hard shell like a fish scale, like a pair of Tongjia, with a pair of transparent films inside.
When the cicada whines, it moves in a thin film.
I use my hand to gently shake this place, and the cicada calls.
I kept pinching, and it kept barking.
I think: this pair of film is its pronunciation device!
I pricked the film.
No matter how I pinched it, it wouldn't scream.
Later, my mother told me that this is the "soundboard" of cicadas, a male cicada special pronunciation device.
The muscles of the vocal membrane contract and vibrate, and cicadas make sounds.
Female cicadas are mute because they don't have a soundboard.
这时，我才明白，蝉叫的时候，为什么总爱“挺胸”和“翘尾”了。
揭开了蝉发音的秘密，我又遥尝到了动脑筋、学科学的甜头。
At this time, I can understand why cicadas always love "open chest" and "cocked tail".
The secret of cicada's pronunciation has been revealed, and I have once again tasted the sweetness of using my brain and learning science.