Moving a stack of size 3, again, if I want to go over there, I need to make sure I can put the spare one over here before I move the bottom one, I can't cover up any of the smaller ones with the larger one, but I can get it there.

移动上面的三个圆盘的话，我在移动最底下的圆盘之前，同样要确保剩下的,是在另外一个柱子上，因为我不能把大的圆盘,放在小的上面。

麻省理工公开课 - 计算机科学及编程导论课程节选

Where do you usually go when you have some spare time?

当你有业余时间的时候，你经常去哪里？

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When I have spare time, I like to go running.

我有空的时候，喜欢去跑步。

在空闲时间 - SpeakingMax英语口语达人