复杂性来自实际实现请求动作的浏览器。

The complexity comes from the browser actually carrying out the requested action.

youdao

这个机制的实际实现取决于你选择使用的消息工厂。

The actual implementation of this mechanism depends on the message factory you choose to use.

youdao

但现在您要理解更困难的部分：封装器的实际实现。

But now you come to the hard part: the actual implementation of the wrapper.

youdao

And we want to do that in tangible, concrete ways, but the question is how? -Absolutely.

而且想用实际具体的方法来实现这个目标，但问题是怎么做？，-对。

普林斯顿公开课 - 人性课程节选

I want to get to there starting from real sodium and real chlorine.

我们要实现这一步,从实际的钠和实际的氯开始。

麻省理工公开课 - 固态化学导论课程节选