名词
中文翻译：手计时器同义词
同义词：
['handheld timer', 'hand-held timer']
例句：
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1. The teacher used a hand timer to help the students understand the concept of time.
老师使用手计时器帮助学生理解时间的概念。
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2. The engineer used a hand timer to measure the duration of the experiment.
工程师使用手计时器测量实验的持续时间。
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3. The student used a hand timer to keep track of their progress during the project.
学生使用手计时器跟踪他们在项目中的进度。