common knowledge可数吗

common knowledge可数吗 knowledge 可数吗? common knowledge （常识）可数吗? 造2个句,谢谢. knowledge可数吗 knowledge可数吗? common sense 可数吗 knowledge是可数名词吗? knowledge是可数名词吗? common knowledge同义词 common sense可数吗?举个例子 common sense ,common knowledge ,normal practice knowledge到底可不可数? knowledge不可数还是可数 knowledge可不可数? knowledge 是可数还是不可数, common knowledge 前用不用加a? it is common knowledge that同义词 到底是it's common knowledge还是it's a common knowledge? 常识用英语怎么说general knowledge?common knowledge?common sense?gerenalknowledge和common knowledge哪个常用点这里面的common是什么意思？