减速器的英文：
moderator

Cycloidal gear reductor
摆线针轮减速器

Because its transmisson efficiency is higher, the reducer can also be used as a speed increaser.
该行星减速器适应于传动中小功率，由于其效率较高，也可用作增速器。

Moderation in all things
凡事中庸而行

Moderation in all things.
万事取其中道。

Moderate exercise is indicated.
适当的运动也是需要的。

There must be externally moderated tests.
一定要有外聘人员负责审核评分的考试。

Moderates have displaced the extremists on the committee.
在委员会中，稳健派人士取代了激进派人士。