competition 可不可数

作比赛时可数，作竞争时不可数．
具体看下面．

competition
KK: []
DJ: []
n.
1. 竞争,角逐[U][(+with/between/for)]
Competition among youths to enter the best colleges is intense.
年轻人想进一流大学的竞争是很激烈的。
2. 比赛,竞赛;赛会[C][+to-v]
I entered a chess competition and finished third.
我参加了象棋比赛名列第三。
3. (总称)竞争者;比赛对手[U]
He's no competition for Henry.
他不是亨利的对手。

competition
KK: []
DJ: []
n.
1. 竞争,角逐[U][(+with/between/for)]
Competition among youths to enter the best colleges is intense.
年轻人想进一流大学的竞争是很激烈的。
2. 比赛,竞赛;赛会[C][+to-v]
I entered a chess competition and finished third.
我参加了象棋比赛名列第三。
3. (总称)竞争者;比赛对手[U]
He's no competition for Henry.
他不是亨利的对手。

作比赛时可数，作竞争时不可数．