1. for a second

一会儿，片刻

eg. But for a second, I hesitated. And she saw it.

但在一秒钟内，我犹豫了，她看出了这点。

eg. For a second we both sit there, like playing cards or something.

有一两秒钟，我们俩都坐在那里，就像在打扑克牌什么的。

2. now and again

不时；时而

eg. There were mainly foreigners living there, so we could chat with them now and again.

那里进进出出都是外国人, 我们可以时不时和他们搭讪聊天.

eg. Zoom in and zoom out every now and again to make sure you are moving forward with the overall task.

时而不时地从全局和部分来看任务计划，确保你在完成整个任务过程中一直在前进。

3. aware of

意识到，知道

eg. Yon can only humbug those who are not aware of your tricks.

你只能欺骗还不清楚你的伎俩的那些人。

eg. I need not press the urgency of the matter on you, as I konw you are fully aware of it yourselves.

我无需向你们强调此事的急迫性，因为我知道，你们自己对此完全了解。