If great accuracy is required, the gear must be ground.

如果对齿轮有精度要求，齿轮就必须经过磨削。

Apart from climatic variables, the trip also involved a mix of work and pleasure, including a short fishing holiday in Guatemala which also required me to pack some specialized gear and gadgets.

除了气候差异较大之外，这次旅行的内容也是公务和休闲参半，其中还包括去危地马拉钓鱼，所以我得带上一些特殊的装备和器具。

Electric motors in other countries may operate at 1350 RPM so a different reduction gear set will be required.

在其他国家电动机可运行在1350转这样一个不同的减速将需要设置。