啄木鸟在啄木头的时候，每秒头部向树撞击20次，你估计觉得这样它会需要一个坚如钢铁的脑袋来得以生存，但事实上，啄木鸟的脑袋是相对较软的，每只啄木鸟在出生时，鸟喙后长有一个软的海棉状的物质，用来吸收啄木头时所产生的震动。

Instead, the reality is that woodpecker heads are relatively soft. Each bird is born with a soft, sponge-like mass behind its beak that absorbs the shock created by pecking.

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本软拉手颠簸路面行驶过程中，不会撞击乘员对乘员造成伤害。

During the process of driving on a bumpy road, the soft handle cannot impact the passengers so as not to hurt the passengers, and generates no noises.

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