1. pull apart

撕开；扯断

eg. Each LEGO brick must have that perfect grasp -- strong enough to hold onto another brick but easy enough for a child to pull apart.

每一块乐高砖必须拥有那种完美的控制——相互拼插在一起的时候足够牢固同时又很容易被孩子们拆开。

eg. This proves to be really difficult in the real world because in the real world it's hard to pull apart genes and environments So, you and me will have different personalities ? Why?

这在现实中是很难区分的,因为现实中很难,把基因和环境分开来讲,你和我有不同的性格,为什么？

2. approach to

接近；约等于；通往…的方法

eg. So how do you decide which approach to use?

那么如何决定要使用哪种方法呢？

eg. But for this approach to work, there should be a message correlation mechanism.

但是要使此方法正常工作，应该存在消息相关性机制。

3. at the time

在那时，那时候

eg. What were you feeling at the time?

你那时是怎么感觉的呢？

eg. It was hard for me to comprehend at the time, but now I do.

那个时候我还太难以领会这一切，不过现在我知道了。