名词
中文翻译：手电筒转速表
同义词：
['hand-held tachometer', 'hand-operated tachometer']
例句：
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1.The engineer used a hand tachometer to measure the speed of the engine.
工程师使用手电筒转速表来测量发动机的速度。
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2. The car's hand tachometer showed that it was going too fast.
汽车的手电筒转速表显示它跑得太快了。
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3.The technician adjusted the hand tachometer to ensure accurate readings.
技术员调整了手电筒转速表以确保准确的读数。