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。
Pulley: in mechanics, a wheel that carries a flexible rope, cord, cable, chain, or Belt on its rim.
滑轮：力学上的一种装置，在边缘装有活动绳索、弦、缆、链条或带子的轮。
Cadaveric dissection reveals that the trochlea is more than a simple pulley; it is a complex structure in close proximity to the orbital rim.
尸头解剖结果显示滑车不只是简单的滑车，而是与眶缘极为靠近的复杂结构。
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