忘恩负义: devoid of gratitude; be ungrateful and act contrary to justice; be ungrateful and leave one's benefactor in the lurch; be ungrateful and treacherous; be ungrateful to kindness; forget a fa
辜负: let down; wrong; fail to live up to; be unworthy of; disappoint 短语和例子我们决不要辜负老师的谆谆教导。 we must never be unworthy of our teachers' untiring and sincere teachings