But some things are personal or private, and questions about them are not polite.
但是有些事是私人的,问这些方面的问题是不礼貌的。
Set a beggar on horseback and he'll ride to the devil.
小人得意,忘乎所以。
Imagine their surprise and delight when they broke open the packing cases and found that the fourth engine was sweet as honey -- still in perfect condition.