1·His noble deed deserves praise.
他高尚的行为值得称颂。
2·A noble deed never dies.
崇高的事业名垂青史。
3·At what point does a noble deed turn into fanaticism?
告诉我，是怎么从做一桩善举，走上不归路的？
4·Deeply moved by his selfless spirit, I am writing you to commend his noble deed.
深深地为他的无私精神所感动，因此特写信表扬他的高尚行为。