三个儿子对他们白干了一场，感到大失所望。
The three sons were bitterly disappointed to have all their work for nothing.
但要这么个弱不禁风、哭哭啼啼的孩子作儿子，让我大失所望！
But I'm bitterly disappointed at having such a weak, crying baby for a son! '!
他们对儿子期望甚高，所以听说儿子考试不及格，不禁大失所望，很是气愤。
Having placed great expectations on their son, they couldn't hold back huge disappointment and anger when they learnt their son's failure to pass the test.
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