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。

No, now. Evolutionary biologist Robin Dunbar has identified gossip as an aid to social bonding in large groups.

别急啊 进化生物学家罗宾·邓巴把八卦定义为一种有助于在大群体内维系感情的手段。

Hence those who use fire as an aid to the attack show intelligence; those who use water as an aid to the attack gain an accession of strength.

故以火佐攻者明，以水佐攻者强。

She felt his kisses on her lips and on her cheeks for a long time afterwards; the sensation was rather an obstacle than an aid to reflexion.

之后很长一段时间，她都感觉到他的吻在她的嘴唇和脸颊上。这种感觉与其说是帮助反射，倒不如说是一种障碍。

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。