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If the street is covered by the rainwater, people cannot identify whether there is a hole under the water, especially at night. So people are prone to walk into the hole and fall on the ground. This problem can be solved by the “Detector-Umbrella”, there is a detector on the handle which can emit light, when the light detects a hole, part of the color which covers the hole would turn red in order to warn people not to step into the red area. In this way, people will never worry about stepping into a hole and falling down even the hole on the road is very deep.