completion可数吗

　　例句：

　　The very notion of price competition is foreign to many schools.

　　价格竞争这个概念对于许多学校都很陌生。

　　There's been some fierce competition for the title

　　夺冠之争一直都相当激烈。

　　I have to change my approach, the competition is too good now.

　　我得改变方法，现在的竞争对手太强。