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。
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。
At the onset a sudden loss of consciousness, dropping and caused head injury.
发病时突发意识丧失、摔倒，致头部外伤。
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 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。
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