名词
中文翻译：转速
同义词：
['rotational speed', 'revolutions per minute']
例句：
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1. The car's engine is running at 3000 RPM.
这辆车的引擎以3000 RPM的速度运转。
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2. The helicopter can reach altitudes of up to 30000 feet at its top speed.
这架直升机的最高速度可以达到3万英尺的高度。
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3. The machine has a maximum RPM of 5000, which means it can rotate at that speed for acertain period of time.
这台机器的最大转速为5000 RPM，意味着它可以在那个速度下旋转一段时间。