Antarctic ,which we know very little,is covered with thick ice all the year round

问题描述:

Antarctic ,which we know very little,is covered with thick ice all the year round
这句话改一下错误.为什么不能把which改成as?

应该在which前加about,意思是“我们对它(南极洲)了解得很少”.as引导非限制性定语从句,意思是“正如,正像”,如果这里用as,作know的宾语,那后面的very little就多余了,而且意思上也讲不通的。