1. go back to: 回去，返回；追溯到

(1)（停止一段时间后）回到（某任务、活动等）

eg. I now look forward to going back to work as soon as possible.
我现在盼望尽快回到工作中。

(2) 回到（讲座、讨论、书等的某一点）

eg. Let me just go back to the point I was making.
让我回到我刚才所谈的那一点上。

2. have trouble with: 与……有纠纷；有……的病痛

eg. I have trouble with my roommate.
我和我的室友相处起来有些问题。

eg. Adults more typically have trouble with paying attention, focusing and prioritizing.
成年人更加典型的症状则是很难集中注意力，关注某件事物，分清主次。

3. take off: 使停用

eg. But the idea has been slower to take off in Britain, for predictable reasons.
但在英国，由于可以想象的原因，这个概念没有很快获得接受。