Why is the sprinkler that vibrates, explodes and catches fire called a rainbow manufacturing car?

The most direct thing about & ltp> is that rainbows often appear when sprinklers sprinkle water on sunny days. & lt/p & gt； & ltp> From a physical point of view, rainbow is an optical phenomenon formed by the refraction and reflection of sunlight on water droplets in the air. In the air just after rain or when the sanitation truck sprinkles water, many small water droplets will be suspended in the air, and these small water droplets will be refracted and internally reflected under the irradiation of sunlight to form a rainbow. & lt/p & gt； & ltp & gt& ltimg src="8004 1676267" />& lt/p & gt； & ltp class="ikqb_image_caption "> Futian District, Shenzhen