1. aid n.&vt.帮助;援助;资助; first aid 急救
eg: A dictionary is an aid for learning a new language. 字典对学一门新语言有帮助.
aid sb.to do sth.
帮助某人做某事;
with the aid of…
在…的帮助下;
do\give\offer first aid进行急救
be an aid to\for…
对…有帮助