1、He always puts the needs of others before his own. He is truly unselfish.
他总是把别人的需求放在自己之前。他真的很无私。
2、She volunteered to help without expecting anything in return. Her actions were a perfect display of unselfishness.
她自愿提供帮助，不求任何回报。她的行动完美地展示了无私。