arrangements made between nations to assist each other
mutual aid的用法和样例:
例句
In revision, mutual help is necessary, still I expect independent work from you. 复习时,相互帮助是需要的,但我更希望你们自己努力。
It is a good custom to pass on the Kombucha mushroom to other people as a sign of friendship and mutual helpfulness. 这是好风俗,把康普茶菌菇传递给其他人作为友谊和相互帮助的象征这是好风俗。