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
痛心: pained; distressed; grieved 短语和例子对过去的错误感到痛心 deeply regret one's past mistakes; feel deep regret for one's past mistakes; 这样浪费粮食令人痛心。 it is distressing to see food being wasted like this