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We find people who want to share their own umbrellas with strangers seldom take actions to practice.They may feel awkward for them to ask whether people could help them or need their help . So we redesign the umbrella's tip with a shape of hug which can be lighted . When you are convenient for sharing,you can raise the shell of tip,and tip will shine. Strangers will know you can share your umbrella.
School of Mechanical Engineering