计时图描述了一个时期内的生命线。
The timing diagram portrays lifelines across a period of time.
垂直线代表了序列图之中的时间,但是计时图使用水平线来代表时间。
The vertical axis represents time in sequence diagrams, but the timing diagram USES the horizontal axis to represent time.
当它们经过这条线时,我会开始计时。
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