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When you are outside on a rainy day,but you don't take an umbrella with you.Then you see many single men with an umbrella walking in front of you.At that moment,you want to turn to them for idea of sharing the umbrella with you,but don't have the courage to do that.Will you take action if you see the umbrella says "will you join me" above.
On sunny days,the umbrella is clean without any patterns.But on raining days,the umbrella will become
transparent and the pattern will appear on the face of the umbrella when it touches the rainwater.When the light is poor,the pattern will light which can make itself clearer for people to see.