名词
中文翻译：Unknown
同义词：
['timekeeper', 'timer', 'clock operator']
例句：
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1. The race car driver needs a good timer to keep track of the lap times.
赛车手需要一个好的计时员来记录每圈的时间。
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2. The timekeeper was responsible for ensuring that all events ran smoothly.
计时员负责确保所有活动顺利进行。
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3. The timekeeper had to be very precise in order to ensure fair competition.
计时员必须非常精确，以确保公平竞争。