matter that is not clean 用一个单词来表示"matter that is not clean"的什么意思

问题描述:

matter that is not clean
用一个单词来表示"matter that is not clean"的什么意思

unclear??你是想表达这个意思么?
还是不干净啊

dirt(污垢)
不干净的东西——那就是污垢了