通过试验发现就环状橡胶圈（模拟废旧轮胎）这种柔性加糙体，垂直水流方向的投影面积是影响槽底糙率、水深和流速的主要因素。
By the testing we found the flexible artificial roughness rubber turns which simulated the wasted tires were the main factor which affect the roughness of the bottom which directed to vertical flow.
在进行飞机易损性分析时，需要计算飞机及各部件在垂直于来袭方向的投影面积。
In aircraft vulnerability analysis, it is necessary to calculate the projection areas of the aircraft and its critical components facing against the attacked direction.
在进行飞机易损性分析时，需要计算飞机及各部件在垂直于来袭方向的投影面积。
In aircraft vulnerability analysis, it is necessary to calculate the projection areas of the aircraft and its critical components facing against the attacked direction.
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