Photons travelling at any other angle within the material are reflected back inside when they reach the surface.
在发热材料内其运动方向与材料表面成其它任何角度的光子在碰到表面时都会被反弹回来。
2
Then, at the same place, bend it back to form a right-angle in the opposite direction.
然后，在同一个地方，把它弯回去形成反方向的直角。
3
Mr Reid is pounding her for those statements and Ms Angle is back-pedalling, saying that, actually, she wants to “keep the promise of Social Security”.