分清场合。
Think about where you are.
You should consider where you are.
你也不看看你多大了。
Act your age. *一般用在父母等上年纪的人教育年轻人时。“做和自己年龄相符的举止、行为”。
How do you like my new red skirt? (你觉得我这条新的红裙子怎么样?)
Act your age. (你也不看看你多大了。)
You should act your age. *比较温和的说法。
Behave in accordance with what is expected of your age!
You should behave more maturely. (你该表现得更成熟些。)
You shouldn't act like a child. (别像个孩子似的。)
你想得也太天真了。
Your view is too optimistic. *optimistic “乐观的”，“乐天派的”。
你的想法太不现实了。
You should get your head out of the clouds. *直译是“你应该把你的脑袋从云中伸出来”，即“你的想法太不实际了，回到现实中吧”。
You should get your head out of the clouds. (你的想法太离谱了。)
Maybe you're right. I should try to be more down-to-earth. (也许你是对的。我该更现实点儿。)
You aren't being realistic.
You should be more logical. *logical “符合逻辑的”、“道理上讲得通的”。
别再重复这种愚蠢的错误了。
Don't make such stupid mistakes again! *make a mistake 惯用语， “出错”。
Don't make such stupid mistakes again! (不要重复这种愚蠢的错误。)
I won't, I won't. (不会了，不会了。)
You should be more careful! (你应该多加小心。)
Don't make dumb mistakes again!
别那么自命不凡。
Don't be stuck-up. *stuck-up “骄傲自满”、“自高自大”。
Don't be so pompous¹. *pompous “装模作样的”、“自负的”、“华而不实的”。
Don't be such a snob². *snob “势利小人”、“看人行事的俗人”。
Don't act like you're better than I am.
Don't flatter yourself so much. (别那么自以为是。) *flatter oneself “骄傲自满”、“得意洋洋”。
人不可貌相。
Don't judge a book by its cover. *谚语，直译“不要根据书皮来判断书的内容”。
He's so short. (他的个儿多矮呀。)
Listen, don't judge a book by its cover. He was the best basketball player in California last year. (喂!你可不能以貌取人，他是去年加利福尼亚最棒的篮球运动员。)
Never judge something by its looks.
Appearances are deceiving. (不能以貌取人。)
Don't form an opinion about something based on appearance alone. (人不可貌相。)