expensive的动词和形容词
动词形式是expend，意思是花费，花销，形容词形式是expensive，意思是昂贵的，例如：
1、The new office block has become an expensive white elephant.这座新办公大楼成了昂贵的摆设。
2、Making the wrong decision could prove expensive.错误的决策可能会付出昂贵的代价。
3、The other one was much too expensive.另一个太贵了。