Everyone knows from calculus that if you're trying to find a function about which you know only the derivative, you can always add a constant to one person's answer without changing anything.

学过微积分的人都知道,如果你想根据已知的导数,求出其原函数,你总是可以给某人的答案,随便加一个常数,且不影响结果

耶鲁公开课 - 基础物理课程节选

Maybe I can help you find the answer if we talk about it a little bit longer.

要是我们多讨论一会儿的话，也许我能帮你找到答案。

Do you 实战 - SpeakingMax英语口语达人