助人为乐
[词典] find [take] pleasure [delight] in helping others; be generous in giving help; be glad to help others; be happy that one can be of help to others;
[例句]我们要在青少年中大力提倡勤奋学习助人为乐的革命风尚。
We should work hard to cultivate in young people the revolutionary style of learning diligently and taking pleasure in helping others.