Remember, any white pixels you put in your foreground image will provide a mask over the background frames.
记住，在您的前景图像中所使用的任何白色像素将提供背景帧的蒙版。
When he finally made it to the medical office, the school nurse led him to a bed, removed his tie, then placed a mask over his mouth and nose. The cool rush of oxygen brought some relief.
他来到学校的医务室，护士让他躺在床上，松开他的领带，然后给他戴上氧气面罩凉爽的氧气使他的症状得到一些缓解。
Place rescuer's mouth or CPR pocket mask over client's mouth, forming an airtight seal.
抢救者用口或CPR袖珍面罩封住病人口唇，形成一个密闭气道。
To start the flow of oxygen, pull the mask towards you. Place the mask over your nose and mouth, slip the elastic strap over your head, tighten it by pulling the end of the strap.
氧气面罩落下后，请用力向下拉，罩在口鼻处，将带子套在头上，可通过带子调节松紧。
To start the flow of oxygen, pull the mask towards you. Place the mask over your nose and mouth, slip the elastic strap over your head, tighten it by pulling the end of the strap.
氧气面罩落下后，请用力向下拉，罩在口鼻处，将带子套在头上，可通过带子调节松紧。
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