你记得它的用途或者当老师在黑板上写字时它发出的声音吗？

Are you remembering what it is used for, or the sound it makes when the teacher writes on the blackboard?

youdao

我经常看到人们冲进电梯，却没有先给里面的人一个出去的机会，或者当别人为他们开门时，他们从来不说“谢谢”。

Too often I see people rushing into elevators without giving those inside a chance out first, or never saying "Thank you" when others hold the door open for them.

youdao

只有当母老虎在保护自己的幼崽时，或者当公虎在保护母老虎不受其他雄性动物的注意时，它们才会殊死搏斗。

Tigers fight to death only when a tigress is defending her young, or when a tiger is guarding a tigress from the attentions of other males.

youdao

You see, in the previous empires, like the Assyrian Empire, or these kinds of-- the Egyptian Empire, when people conquered other peoples, often all they wanted was tribute.

之前的各个帝国，比如亚述帝国，或者埃及帝国-,当他们战胜其他民族时，往往只是觊觎贡品。

耶鲁公开课 - 新约课程节选

when you feel upset or when you feel frustrated that something is not going the way that you wish it would.

当你觉得很失落，或者当你因为事情不像你期望的那样进展而感到沮丧时，你也可以使用这个句型。

I'm frustrated 课堂 - SpeakingMax英语口语达人

So 1.1 times 10 to the -31 meters is not, in fact, a significant number when we're comparing it, for example, to the length of a ball, or the size of the baseball field.

所以1，1乘以10的负31次方米，事实上并不是一个很重要的数字，举例来说，当它与一个球的长度，或者一块棒球场地对比时。

麻省理工公开课 - 化学原理课程节选