All of the expedition's food, water, and gear had to be hauled to the summit rim, then lowered by pulley into the caldera.
探险队所有的补给和器材都要被拖曳到峰顶边缘，然后再通过滑轮垂降到火山口中。
The ratio of rim thickness to tooth height was defined for representing the flexibility of internal ring gear.
以轮缘厚度系数来描述内齿圈的柔性，以均布的弹簧约束来反映内齿圈与机体的配合情况。
The ratio of rim thickness to tooth height was defined for representing the flexibility of internal ring gear.
以轮缘厚度系数来描述内齿圈的柔性，以均布的弹簧约束来反映内齿圈与机体的配合情况。
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