留美老师带你每天说英文 第372期:完美无瑕的钻石

台湾籍旅美老师今天交给我们的句子是：

Ideally the diamond is flawless if you can't see any of that stuff under ten times the magnification. The higher the clarity the more rare and expensive it is.
理想来说一颗钻石在放大了十倍之后还没看到任何杂质，它就完美无瑕了。钻石的净度越高，数量就会越少，价格也更昂贵。