名词
中文翻译：机械计时器
同义词：
['mechanical clock', 'timing device']
例句：
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1. The mechanical timer on the watch is accurate to within a second.
手表上的机械计时器非常准确，误差不超过一秒。
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2. The engineer used a mechanical timer to measure the distance between the two points.
工程师使用机械计时器测量了两点之间的距离。
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3. The mechanical timer was designed to be easy to operate and maintain.
这种机械计时器设计得易于操作和维护。