How to say "Excuse Me" in Chinese:

Qing3 = Please
wen4 = ask

What are these numbers? 

"Qin3 wen4" means May I ask? as well as Excuse me. It is used in situations when you need to ask a question to someone you don't know.

There is another way to say excuse me and it's "Dui4 bu5 qi3". This can also mean "I'm sorry".