当具体指定泵和热交换器的时候，考虑在开始设计值的基础上留下压力足够升降变动值。

When specifying pumps and heat exchangers, allow ample margins for pressure drop increases above stated design values.

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不过必须承认，当具体到新兴事物的时候，我们的祖辈并不能像我们一样很快的转向新的趋势，因此不能给我们有效的建议。

Admittedly, when given new objects, our grandparents could not alter to the new trends as we could, thus not being able to provide useful Suggestions.

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然而，当需求变得更具体时，他们可以用更长的短语来满足所需。

When the needs become more specific, however, they can make up longer phrases to meet the needs.

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We'll talk about exactly what a gel is later when we talk about biomechanics and cells are suspended within it.

之后当我们谈到生物力学的时候,会具体讲讲这个凝胶是什么,以及细胞是怎样悬浮在其中的

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Use "When" whenever you want to ask about the timing of a certain event or series of events.

当你想要询问一个或一系列事件的具体时间时，你可以用“When”句型。

When 课堂 - SpeakingMax英语口语达人

And we're going to talk about this more when we talk about cell culturing later, and we'll talk about lots of potential applications of that as well.

当我们晚一点讲细胞培养的时候,会具体讲这些内容,我们也会讲,细胞培养技术的一些潜在应用

耶鲁公开课 - 生物医学工程探索课程节选