To offer a benefit or kindness at little to no cost to oneself; a benevolent act that requires no personal sacrifice.
分享自己的经验是一种惠而不费的好方法，既能帮助别人，自己也能巩固知识。
Sharing one's experience is a good way to offer a benefit without personal cost; it helps others while also reinforcing one's own knowledge.
Era:
Ancient
Frequency:
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