First, notes are an aid to memory.

首先，笔记能帮助记忆。

E-cigarettes are an aid to help people quit smoking.

电子烟是用来帮助人们戒烟的一种辅助工具。

William Galston was an aid to Bill Clinton when he served as president.

威廉·加尔斯顿（William Galston）是前总统比尔·克林顿的助手。

Nevertheless, Mr. Lydgate, I hope we shall not vary in sentiment as to a measure in which you are not likely to be actively concerned, but in which your sympathetic concurrence may be an aid to me.

尽管如此，Lydgate 先生， 我希望我们不会对一项您不太可能积极关注但您的同情同意可能对我有所帮助的措施持不同看法。