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The most fragile part of an umbrella is bead.Most umbrella beads are made of plastic material.After repeated use,theumberlla beads will be broken easily. The steel wire will come outside and hurt other people.As we all konw,umbrella is the emergent tool during the rainy day,there’s no time to fix it before going outside.However,the used umbrella is wet,we have no desire to repair it,so we ofen choose to leave it aside.Next time when we need it.
Hefei Normal University
Huijuan Yu ,
West Anhui University
Long Luo ,