| 释义 |
DEFINITIVE EXAMPLES 权威例句〔clockwork〕A mechanism of geared wheels driven by a wound spring, as in a mechanical clock.钟表机械，发条装置：一种由齿轮组成的机械装置，由弹簧驱动，如机械表内部的装置美国传统〔engage〕When the large gear wheel engages (with the smaller one), the mill stone will start to go round.当大齿轮（与小齿轮）啮合时，石磨就开始转动。剑桥高阶〔planet wheel〕One of the small gear wheels in an epicyclic train.行星齿轮：周转轮系中的小齿轮之一美国传统 |