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When we torn off band-aid from the wound ,it
always feel very painful ,because band-aid stick to
the skin and hairs around the wound.
this is a special band-aid when we want to
change or torn off it，just put it very near the
household light，and the band-aid will lose its
viscosity in 30 second，then it can be removed
when the band-aid is not very near the light,it will
get viscous again，so we need not to warry about
how to keep it.