The paths of incidence and reflection are in a plane normal to the surface.

入射和反射的路径都在与表面垂直的平面内。

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You can imagine superimposing a sphere on the image above, and then taking a plane normal to the point of interest.

你可以想象叠加就上述领域的形象，然后以正常的飞机的兴趣点。

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A comprehensive study of free vibration, buckling and bending of anisotropic simply-supported skew plates subjected to in-plane normal and shear forces is conducted.

对简支各向异性平行四边形板在面内张力和剪力作用下自由振动、屈曲和弯曲问题作了全面的研究。

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China's Foreign Ministry spokesman Hong Lei, however, said during a regular news briefing that the plane's flight was "completely normal".

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Log books indicate a mechanic certified the plane had been tested and "throughout its normal range of speeds" and maneuvers.

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He said the plane did not crash land but came to a normal halt after the blow out.

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