The good news is that, because everyone's self-image changes over time, self-esteem is not fixed for life.

值得欣慰的是自尊也并非一成不变的，因为随着时间的推移人们的自我形象也在不断变化着。

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If your log was not collected over a fixed time period, zooming in on a set time period will ensure that the total is shown only for that period.

如果在固定的时间段内没有收集日志，则放大该设置的时间段将确保只显示该时间段的总数量。

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My learning how to say, the usual time basic is not fixed and downs, but when I was in big test such as the final exam is always leading the way.

我的学习成绩怎么说呢，平常的时候基本不固定时好时坏，但是我在大考例如期末考试的时候又总是名列前茅。

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The timing of general elections is not fixed in the UK. We have taken the five-year time limit imposed on governments as the point at which to judge whether or not a pledge has been met.

BBC: Analysis: Labour's pledges

And the goal is not time-bound because it has no starting point, no ending point, and no fixed duration.

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Another issue is that unlike some clinical trials, the study does not end after a fixed period of time.

FORBES: Pharmaceuticals