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People often don't know when to change bandages which can be easily contaminated and therefore cause damage for wound recovery. Like air which is often polluted and not protected, people treat bandage in the same way. Combining this with bandage, different scenes appear in the bandage according to different status: when bandage needs to be replaced, a scene of environmental pollution appear; when the bandage is clean, green scenario is presented.
liyuan liu， lei shi，yulu zhu