The vertical axis represents time in sequence diagrams, but the timing diagram USES the horizontal axis to represent 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 timing diagram portrays lifelines across a period of time.
计时图描述了一个时期内的生命线。
Timing diagram: a timing diagram explores the behaviors of one or more objects during a specified period of time.
时间图：时间图探究了具体的时期中一个或多个对象的行为。
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