1. know about: 知道，了解

eg. I happened to know about him.
我碰巧了解他的情况。

eg. I know nothing about this matter.
我对此一无所知。

2. to be honest: 实在地

eg. To be honest, I was surprised he knew where I was, we moved so often.
说实话，我感到惊讶的是他知道我在哪里，我们搬家搬得这么勤。

3. so far: 迄今为止

eg. So far, they appear to be up to the task.
到目前为止，他们表现出承担了这一任务。

4. below the surface: 深入，实际上

eg. Both strategies lie below the surface of most of the commonly held attitudes to climate change.
实际上，这两种策略普遍存在于对气候变化所持的态度之中。

5. respond to: 响应

eg. So how do the different skill levels respond to a model like this?
那么不同的技能水平又如何回应到这样的模型上呢？

eg. People respond to incentives, so if you want something done, reach for your wallet.
人们会对激励做出反应，所以如果你想办成什么事，那就掏钱。