哺乳动物用它起平衡身体、传递信号和支撑物体的作用，尾巴在猿猴和人类中已经消失了。

Useful for mammals that use tails for balance, species-to-species signaling, and support, the tail is missing in apes and in humans.

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它在全球能源平衡中起很关键的作用。

It has a critical role in the global energy balance.

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美国并不肩负着维护亚洲的力量平衡的整个重担，但必须要起带头作用。

Washington does not have to shoulder the entire burden of preserving the Asian power balance, but it must lead.

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