frontal l drag 迎面阻力
Frontal drag is reduced by thrusting and kicking, which brings the body up higher out of the water.
前沿阻力可以由迅捷而有力的前伸和打水来克服，比如前伸和打腿动作能把更大部分的身体前部抬高。
Automotive frontal area is projected area of automobile driving direction, which is necessary parameter of measuring automotive air drag coefficient.
汽车迎风面积是指汽车在行驶方向的投影面积，汽车迎风面积是求汽车空气阻力系数的必需参数。
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