Refringency
折射系数
🗣️ 情景例句
Her efforts were rewarded by good results.
她的努力获得了良好的结果。
There are three apples on the plate.
盘子上面有三个苹果。
We owe a lot to the birds and beasts who eat insects but all of them put together kill only a fraction of the number destroyed by spiders.
我们要十分感谢那些吃昆虫的鸟和兽，然而把它们所杀死的昆虫全部加在一起也只相当于蜘蛛所消灭的一小部分。