not to know [distinguish] good from bad;not to appreciate what is good;not to know what's good for oneself;not to know chalk from cheese ;

Harry's bellowing cod-psychoanalysis of Voldemort is jarringly awful.
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.
来源:互联网摘选You are really an ungrateful wretch to complain instead of thanking him.
你不但不谢他,还埋怨他,真不知好歹.
来源:《现代汉英综合大词典》" No fooling, I've really got a thing about you, so count yourself in luck!
“ 不屈心, 我真疼你, 你也别不知好歹!
来源:汉英文学 - 骆驼祥子
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