completion可數(shù)嗎

　　例句：

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

　　價(jià)格競爭這個(gè)概念對(duì)于許多學(xué)校都很陌生。

　　There's been some fierce competition for the title

　　奪冠之爭一直都相當(dāng)激烈。

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

　　我得改變方法，現(xiàn)在的競爭對(duì)手太強(qiáng)。