The time expression is not obligatory .

不一定要有表示时间的词语。

youdao

The ending time value must be later than the starting time for the Log Time expression.

日志时间表达式中的结束时间值必须晚于开始时间。

youdao

As a concrete example, the optimal time expression of the elastic vibration system has been derived for the first time.

作为实例，第一次导出了弹性振动系统最优时间的明显的表达式。

youdao

A popular expression used at the time was MGM had "more stars than there are in heaven."

VOA: special.2009.05.31

Well, well and good, but at the same time, if that's the case, and if there is this extraordinary emphasis on the importance of the expression of genius, you can see what's beginning to happen.

很好，但与此同时，如果过于重视那些,天才作家的表达，你可以看到它所引起的后果。

耶鲁公开课 - 文学理论导论课程节选

The rest of the time I want to talk about expression of genes, of new genes.

剩下的时间里我想讲讲基因的表达,新基因的表达

耶鲁公开课 - 生物医学工程探索课程节选

But at the time the expression matched the widespread feeling about the British leader, pugnaciously leading a brave nation against an all-conquering foe.

ECONOMIST: Yousuf Karsh

And that contribution to America by Ireland is a continuing one, one that we have to find and give modern expression to all the time.

WHITEHOUSE: President Obama and Taoiseach Cowen

At the same time, allowing some freedom of individual expression can have positive impacts on company culture and employee satisfaction.

CNN: Decoding the workplace dress code