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。