It took him more than seven days and several stops to do it.

他用了7天多的时间，其中还有数次的停歇。

All at great expense. If we stopped to do the cost-benefit analysis, we'd never go anywhere. Yet we do.

而且还很贵。若我们停下来分析成本效益，我们恐怕哪里都不会去。但我们依然东奔西跑。

I'd seen how badly off the man was and stopped to do what I could.

我已经看到这个人的处境有多糟糕，并停下来做我能做的事。

To stop to do something means to pause or interrupt one activity in order to start another activity.

停下来做某事意味着暂停或中断一项活动以开始另一项活动。

Finally, on the morning he stopped to do press-ups on the pavement outside the house, I opened the front door and stepped out.

最后， 在他停下来在屋外的人行道上做俯卧撑的那天早上，我打开前门走了出去。

And indeed, we could engineer messenger RNA therapies which could teach the immune system to stop to do that, without inhibiting the whole immune system, by just communicating with the immune cells which are attacking.

事实上，我们可以设计信使 RNA 疗法， 它可以教免疫系统停止这样做，而不会抑制整个免疫系统， 只需与正在攻击的免疫细胞进行交流。