用秒表计时。
To time (something) by means of a stopwatch.
更宽泛，可用于任何计时设备，不特指体育计时。
更正式，指高精度计时器，通常用于科学或航海。
同义词，但较少使用，通常指实验室用计时器。
通常指手表上的计时功能，与独立秒表不同
指倒计时或设定时间后发出警报的设备，而stopwatch是累计计时
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