我们彼此有个约定，就是在有需要时互相帮助。

We have a mutual agreement to help each other out when necessary.

youdao

作仆人的意义是要放弃操控自己时间表的权利，让神在有需要时去打乱你的计划。

Being a servant means giving up the right to control your schedule and allowing God to interrupt it whenever he needs to.

youdao

因此我们邀请你在有需要时，或只是想要一段奇特的友好闲聊时来请求我们的帮助。

So we invite you to request assistance as needed or just the odd friendly chat when desired.

youdao

So wherever you happen to be, when you run out gas, there was a gas station close by.

这样无论你在哪里需要加油时,附近就会有一个加油站

耶鲁公开课 - 博弈论课程节选

So, remember when we talk about Coulomb force, what's holding the nucleus and the electron together, there's 2 things we need to think about.

还记得我们在讨论库仑力的时候，提到是什么将原子核与电子束缚在一起时，有两点需要考虑。

麻省理工公开课 - 化学原理课程节选