它被锯齿形的山脊所环绕。

Surrounded by a jagged mountain ridge.

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这些锯齿形的下颌唯一的任务就是-要开一条出路。

These jagged jaws are for one job only - cutting their way out.

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因此，复合齿形的摆线齿轮传动较原齿形的摆针传动效率高、承载能力大。

Therefore the large reduction ratio's cyclo drive has higher efficiency and larger capacity than the common form of teeth.

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