He is well versed in different methodologies and knows how and when to apply them.

他精通不同的方法学，并且知道怎样以及何时需要使用它们。

youdao

What separates the professional from the tyro is knowing when to apply the power of scripting and when to eschew it.

专家和新手的区别在于：知道什么时候 运用该脚本，什么时候 避免使用它。

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Of course, knowing when to apply such clever features is the crux of the matter, and all of us struggle with it from time to time.

当然，知道什么时候应用这么聪明的特性是问题的关键，而我们都在不断地为之努力。

youdao

But when they apply for federal funds for social programs, we expect them to run their programs according to the Constitutional principle.

担当它们申请获得联邦基金施行其社会项目时，我们期望它们根据,宪法的原则推行那些项目。

普林斯顿公开课 - 人性课程节选

Why,when dealing with harmony and bass lines, do I want to start by focusing on popular music and then apply those principles to classical music?

为什么在处理和音和低音线时，我是否需要注重流行音乐然后将这些原则应用到古典乐上？

耶鲁公开课 - 聆听音乐课程节选

So we've got about as difficult a economic play as is possible, which is to press the accelerator, in terms of job growth, but then know when to apply the brakes in the out-years, and do that credibly.

WHITEHOUSE: President Obama Closes Forum on Jobs and Economic Growth

But giving effect to that document does not mean picking and choosing when and where to apply it simply because it does not always suit the desires of a United States Senator.

FORBES: Senator Lindsey Graham Says Suspend the Constitution For Boston Marathon Suspect And Designate Him An Enemy Combatant

The rules never came, adding to the general chaos and confusion when the time arrived to apply them.

FORBES: The Cyprus 'Bail-In' Exposes 'Too Big To Fail' As All Too Timid