毫无疑问，雄心从来不是长时间思考的好对象。

To be sure, ambition is never a pretty subject to think about for long.

youdao

也许是你一直长时间思考着的问题，又或者是从朋友那学到的一条忠告？

Maybe it's something you've been struggling with for a long time, or maybe it was a piece of advice you learned from a friend.

youdao

当然啦，事前准备充分也大有益处。我和爸爸妈妈花了很长时间思考可能的问题，然后我认真准备了答案并且进行了演练。

I spent a lot of time with my parents brainstorming all possible questions, and then I worked on the answers and rehearsed them thoroughly.

youdao

But, you can see that he was thinking about this structure for all along.

但我们可以想象得到,他对这个结构的思考已经有很长一段时间了。

麻省理工公开课 - 固态化学导论课程节选