Refringence
折射; 折射系数
🗣️ 情景例句
What 's your wish?
你有什么愿望？
The stronger the motivation, the more quickly a person will learn a foreigh language.
一个人学外语的动力越强大、学得就越快。
I slipped and fell downstairs.
我滑了一跤，从楼梯上摔下来了。