To combat this, 'change a blade at the first sign that it starts to drag against the skin, ' said Dr Bunting.
为了防止此类现象，邦廷博士说“第一次出现开始划皮肤的迹象时就应该换刀片。”
2
They must not drag my body on the ground after they have taken my skin.
他们绝不能拖我的身体在地上后，他们已采取我的皮肤。
3
The underwater high-speed vehicle surfaces are enveloped by cavity entirely or mostly, which reduces skin friction drag and allows the vehicle to obtain high speed.