A ratchet allows a heavy weight to be raised in short successive stages. 棘輪可在簡(jiǎn)短連續的步驟內就把一個(gè)重物抬高。
As the piston descended, a ratchet engaged the piston rod and engine shaft and thus power was transmitted. 當活塞下行時(shí)，棘輪連接活塞桿和發(fā)動(dòng)機軸，因此將功率輸送出去。
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