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。

youdao

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。

youdao

And now I'm going to time it, and my timing uncertainty is of course dictated by my reaction time.

现在我要开始计时，我的计时取决于，我的反应时间。

youdao

Right in the January,February, March time-frame. And so the timing was great for us."

VOA: standard.2010.01.27

Craig McCaw is having good luck with his timing this time around.

FORBES: Magazine Article

With respect to development, we plan the content months in advance and, in most cases, are able to work on the DLC at the same time as other features but the release timing gives developers time to polish post product release.

FORBES: THQ CEO Takes on the Game Industry's $60 Price Point

And it put in perspective for me a time, timing and space and tact and understanding the political process and how I could be most effective in my lifetime.

NPR: Hip Hop Takes on Diplomatic Role with State Department