Usually, the doctor fires an alcohol onge and puts it i ide the cup for a short while to make the cup a vacuum one, then he places the vacuum cup i tantly over the selected ot of the skin.

• 通常，医生把一个点燃的酒精棉球放在杯子里一会儿以排出里面的空气使它成为一个真空杯，接着快速地把空杯子放在选定的皮肤上。