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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。

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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。

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Then, at the same place, bend it back to form a right-angle in the opposite direction.

ECONOMIST: Aircraft fatigue

Tom Shanklin - perhaps fortunate to still be on the field after a clumsy challenge in the air on Imanol Harinordoquy - got beyond the gain-line and from there fly-half Jones picked out Byrne's superb angle for the full-back to race 35 untouched metres to the line.

BBC: France 21-16 Wales

Its newly designed, large-aperture, 4x optical zoom lens (with the maximum aperture of F2.0 at wide-angle end), high-sensitivity, back-illuminated 16 megapixel CMOS image sensor, and sensor-shift Shake Reduction system ensure sharp, high-quality, low-noise images.

ENGADGET: Pentax expands ruggedized series with Optio WG-3, Target-exclusive WG-10