Frontal and head loss of hair, People seem very old, not the spirit.
发额角、头顶脱发，显得人苍老，很没有精神。
The medium has an excellent purification efficiency and a very low head loss.
该介质显示优异的净化效率和极低的压降。
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。
Using a mirror, check your head for hair loss.
照一下镜子，看下你的头上有没有掉头发。
Using a mirror, check your head for hair loss.
照一下镜子，看下你的头上有没有掉头发。
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