复数： timekeepers

In fact omega is the official olympic timekeeper .

事实上，欧米茄是奥运会官方指定的计时器品牌。

The watch is an excellent timekeeper .

这个表计时相当精确。

This clock is a good timekeeper .

这钟是一个很好的计时器。

What does this timekeeper do ?

计时员的工作是什么？

Ask for volunteers in each group to serve as facilitator , timekeeper , and speaker .

请求每一组分别派出志愿者扮演协助,计时,及说话者的角色.