business可数吗?

business可数吗? monkey business 是可数名词吗? business能不能做可数名词? business可数是什么意思?不可数是什么意思? 请问单词business是不是可数名词 business到底可不可数?我看到有some urgent business,但也有an urgent business. 谁知道Business/commerce吗?Business/commerce是什么意思? business business business business business Business Business business business business business