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1.The camera shutter clicked twice in a split second.
相机的快门在一瞬间咔嚓响了两次。
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2. The scientist measured the time it took for the light to travel 1 kilometer.
科学家测量了光传播1公里所需的时间。
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3. The clock ticked away the seconds until the final whistle blew.
时钟滴答滴答地走着，直到最后一声哨响。