aid 正式用词，指帮助他人脱离危险或战胜困难，着重强者对急需帮助的弱者的帮助。
assist 强调在提供帮助时，以受助者为主，所给的帮助起第二位或从属的作用。
help 最普通用词，含义广泛。指一般性的或迫切需要的帮助，侧重积极地为他人提供物质、精神或其他方面的帮助。
参考例句
1. Can you help me, my car won't start? 你能帮一下忙吗，我的车发动不起来了。
2. Where can I go for more help? 我能从哪里得到更多的帮助？
3. I gave her a proffer of help. 我给了她一个援助性的建议。
英英解释
n.
1. the activity of contributing to the fulfillment of a need or furtherance of an effort or purpose
2. a resource
3. a means of serving
4. a person who contributes to the fulfillment of a need or furtherance of an effort or purpose v.
1. give help or assistance; be of service
2. be of use
3. improve the condition of
4. abstain from doing; always used with a negative
5. contribute to the furtherance of
6. improve; change for the better
7. help to some food; help with food or drink
8. take or use
