关于光线折射现象

杯子正底部的线没有变化。两侧的向眼睛这边倾斜。显然是光的折射。。
There is no change of the line which is under the cup.But the others may slip to your eyes.So it's the refraction of light.

直线变弯了、光的折射现象

you can see a line out of the cup , it's refraction of light

Draw a line on a paper,and put a glass on it,what to see?Why is it?If you can say it in English!I must do it!

呵呵不错吧，把你全部都翻译了哦~~~~呵呵