... bottom contour chart ==> 海底等深图 bottom contraction ==> 底部收缩 bottom coring ==> 海底取岩心 ...
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舌突起，齿担一种生理构造，位于大多数软体动物的嘴底部，在这之上齿舌来回收缩以击碎食物。
A structure at the base of the mouth of most mollusks over which the radula is drawn back and forth in breaking up food.
由于采用上述结构，所以利用可收缩的螺纹将废弃的塑料瓶收拢，一个瓶的顶部与另一个瓶的底部相套在一起，达到节约空间的目的。
Adopting the structure, the contractile thread can be used to furl the waste plastic bottle. The top of the bottle is sleeved with the bottom of the other to save the space.
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