求翻译：海胆有着很多感应细胞在棘刺、叉棘及管足上，以探测外界的资讯，包括食物的来源、光线的强弱、水流强弱、水质的好坏等。海胆目口部的管足，心形海胆全身的管足与沙钱在口面的管足都是重要的感应器官。海胆虽然没有眼睛，但在反口面的表皮细胞中有眼点及感光细胞，对光线非常敏感。大多数的海胆，如魔鬼海胆都是负趋光性的，即不喜欢光线，多在夜间行动。另外，海胆为了逃避光线，在日间亦会用管足抓着贝壳、藻类或珊瑚碎片，甚至罐头的拉环等遮蔽其身体，以方便觅食。是什么意思？

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Sea urchins have a multi-sensor cells in thorns, and the truck on a ratchet and tube feet, in order to detect the outside information, including food sources, Light of the strong or weak, weak water, water quality, good or bad, and so on. Sea urchins are the mouth, heart-shaped sea urchins the body

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Sea urchins have spines of many sensing cells in Thorn, fork and on the podium, to detect information to the outside world, including food sources, light intensity, strong or weak, the flow of water is good or bad. Sea Urchin mouth sucker, sea urchins, heart of systemic and Sha Qian in the aperture

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