正经人

upright person

正经的书

serious book

假正经

pretend to be upstanding

装出一副正经的样子

put on a show of being decent and honest

人家跟你说正经事，你乐什么呀?

I'm trying to be serious with you, what are you laughing about?

我们必须把钱用在正经的地方。

We must put our money to good use.

他家贫，没有正经念过书。

He comes from a poor family, and has not had any official education.

黄瓜长得正经不错呢。

The cucumbers are really coming in!