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。
The purpose is to compare and to find the relation of normal and random incidence.
目的是了解微穿孔板在随机入射场或混响场内的吸声特性与垂直入射的关系。
The incidence of lumbar muscle strain in athlete and normal people are both high.
损是一种多发病及常见病，在运动员和普通人群中都有较高的发生率。
The incidence of lumbar muscle strain in athlete and normal people are both high.
损是一种多发病及常见病，在运动员和普通人群中都有较高的发生率。
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