Poor as he was, he tried hard to keep up appearances.

尽管穷，他还是拼命装门面。

She often has lunch with her frenemy to keep up appearances.

她经常和她的亦敌亦友一起吃午饭以保持表面上的和谐。

Put on airs (show off, keep up appearances)

摆架子（摆谱儿）

He bought the saloon car to keep up appearances.

他买这辆高级轿车主要是为了撑门面.

We live in a society driven by looks and the ability to keep up appearances.

我们生活在一个由外表及赶上别人外表能力驱使的社会。

They don’t need to be burdened with our marital problems, and if we’re working things out, the least we could do is try to keep up appearances.

——孩子们没必要背负我们的婚姻问题，我们能做的，至少是保持一个好的姿态面对别人。