matter
matter:n.问题,情况,物质,物品,材料
as a matter of fact
e.g.--I'm sorry,but I can't go with you.
-- What's the matter?
--I have an important matter to deal with.
e.g.This is not a matter of quantity,but a matter of quality.
You mustn't drive a car when you are drunk.It's a matter of life and death.
(2) matter:vi.关系重大,要紧
e.g.你做什么对我来说都不要紧.
It doesn't matter to me what you do.