assistance n.协助, 援助, 补助
解析:external assistance外来援助;对外援助
judicial assistance司法协助
non-reimbursable assistance无偿援助
【同】help, aid
【辨析】
help最不正式,特指靠本身力量无法解决的,迫切需要的帮助;
Building more motorways and bypasses will help the environment by reducing pollution and traffic jams in towns and cities...
建造更多的高速公路和绕城道路能够减少城镇中的污染和交通堵塞，有利于改善环境。
aid正式些;
They have already pledged billions of dollars in aid.
他们已经许诺援助几十亿美元。
assistance最正式,来自assist,只表示起到辅助作用.
Any assistance you could give the police will be greatly appreciated...
您提供的任何帮助警方都将万分感谢。