名词
中文翻译：定时器
同义词：
['timer', 'timekeeper']
例句：
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1. The clock has a timer that can be set for the next hour.
这台钟有一个可以设定为下一个小时的计时器。
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2. The engineer used a timer to measure the reaction time of the chemical reaction.
工程师使用计时器来测量化学反应的反应时间。
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3. The teacher used a timer to keep track of the students' progress during the test.
老师使用计时器来跟踪学生们在考试中的进步。