你真是个不知好歹的孩子，整天游手好闲，一无是处！
What a thankless child you are, just idle and good-for-nothing!
你不但不谢他，还埋怨他，真不知好歹。
You are really an ungrateful wretch to complain instead of thanking him.
事实上，他经常换女友，因为他不知好歹。
In fact, he often changes girlfriend, for he doesn't know chalk from cheese.
你们好心留我过夜，所以我不想说些不知好歹的话。
You were kind enough to let me spend the night, so I do not mean to sound ungrateful.
比方哈利对着伏地魔不知好歹地咆哮那一幕，很是刺耳，相当糟糕。
Harry's bellowing cod - psychoanalysis of Voldemort is jarringly awful.
有过以上情形之后，你会受到身在福中不知福的自责；或者你会得到不知好歹的名声。
Have above situation, you'll be blessed in imagines the blame, Or you'll get coat of fame.
已经半夜了，但我一直睡不着，想到自己的不知好歹，简直就像一只令人恶心的大虫子！
It is already midnight, but I cannot sleep because I keep thinking about how ungrateful I was, and I feel like a big, disgusting bug!
已经半夜了，但我一直睡不着，想到自己的不知好歹，简直就像一只令人恶心的大虫子！
It is already midnight, but I cannot sleep because I keep thinking about how ungrateful I was, and I feel like a big, disgusting bug!
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