So, we have a problem here if we're thinking about keeping things at the lowest energy, so there's a lot of ring strain in the system.

现在有个问题,我们考虑要把能量降到最低，所以环上有许多应力。

麻省理工公开课 - 化学原理课程节选

One could have an entire semester devoted to thinking about the philosophical problem of consciousness.

一个人可能得花上整整一个学期,全身心地思考,关于意识的哲学问题

耶鲁公开课 - 死亡课程节选

That's the problem we've been thinking about for the last minute.

那是我们刚才在思考的问题

耶鲁公开课 - 死亡课程节选