local head loss 局部水头损失
universal head loss coefficient 通用压头损失系数
frictional head loss 沿程水头损失 ; 沿程阻力损失
fluid head loss 液体压头损失
knee head loss 弯管水头损失
head loss of pipeline 管路水头损失 ; 管线水头损失
system head loss 系统水头损失
permissible head loss 允许水头损失
limited head loss 极限水头损失
Blood vessels in the head tighten to stop the loss of body heat and then relax to let blood flow rise; that sudden rush of blood is what causes the headache.
头部的血管收紧以阻止身体热量的流失，然后放松让血液流动起来，血液的突然涌入是引起头痛的原因。
Waving can mean welcome and farewell, whereas scratching your head may indicate that you are at a loss.
挥手表示欢迎和告别，而挠头则表示不知所措。
The full round port area provides maximum flow capacity and minimum head loss.
完全的圆形流道截面能够提供最大的流量和最小的流压损失。
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