drag head [机] 耙头
drag head ladder [船] 耙头梯架
active drag head [水运] 主动耙头
suction type drag head 纯吸式耙头
rotor head drag 旋翼头阻力
head-drag coefficient 头部阻力系数
fluid drag and head loss 水流阻力和水头损失
Keeping head down and in line reduces drag.
头降低在身体直线上会减少阻力。
Lifting your head is bad swimming technique, it causes your legs to sink - adding lots of drag.
抬头是很糟糕的游泳技巧，它使腿部下沉，增加不少阻力。
The aerodynamic shape design of train head should consider all kinds of factors because the relation between reducing aerodynamic drag and air pressure pulse may be conflictive and uniform.
减小列车空气阻力和降低列车交会压力波，既矛盾又统一，列车气动头部外形设计需要综合考虑各种因素。
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