expensive如何加前缀

另一种expensive意思是昂贵的。他的前缀是在前边加i构成inexpensive意思是不贵的，便宜的。它的名词是expense，意思是费用，开支。例如

This is such an expensive book that I can't afford to buy it.

这是如此昂贵的一本书，以至于我买不起。

I can afford to buy the expensive Mobile phone to Get in touch with my family and friends.