既可以是可数名词，也可以是不可数名词。cheer作“欢呼，喝彩”解时是可数名词；作“振奋，欢欣”解时是不可数名词。例句：The audience greet his speech with loud cheer.听众对他的演讲报以高声欢呼。
cheer的含义及例句
cheer，英语单词，名词、动词，作名词时意为“ 欢呼，喝彩声；愉快，欢乐的气氛；让人开心的理由；加油歌，加油诗；（喜庆场合供应的）酒菜”。作动词时意为“欢呼，加油；安慰，鼓舞；（使）高兴起来”。
We all cheered as the team came on to the field.
球队入场时我们都为之欢呼。
A great cheer went up from the crowd.
群众爆发出一阵热烈的欢呼声。
The results of the test were very cheering.
化验结果令人欢欣鼓舞。
You need something to cheer you up ─ I know just the thing!
你需要点什么使你高兴起来，我知道什么正合你的需要。
A great cheer went up from the crowd.
观众爆发出一阵热烈的欢呼声。