因为在一些比赛中，一旦秒表开始计时，比赛就必须在无人类引导和控制下进行。
Because in some of the events, once the stopwatch ticks off, the competition must go on without any human guidance or control.
他开始用秒表为他们计时，于是他们变快了。
He started timing them with a stopwatch, and they got faster.
秒表——指定开始和停止的计时器。
Stopwatch — specifies a timer that can be started and stopped.
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