到底是there wil be heavy snow.还是there will be a heavy snow,为什么不加a?两场大雪又怎么说呢

问题描述:

到底是there wil be heavy snow.还是there will be a heavy snow,为什么不加a?两场大雪又怎么说呢
其实我是想问There will be heavy snow in Beijing这句话对吗?为什么对?为什么没有a

there will be a heavy snow, 应该是一场所以有a
there will be two heavy snows
强调场数也应可数