When a neutrino hits a water molecule it emits a kind of blue light, a flash of blue light, and by looking for this blue light, you can essentially understand something about the neutrino and then, indirectly, something about the dark matter that might have created this neutrino.
中微子撞击水分子是 会产生一种蓝光 一种飞逝的蓝光， 但是通过需要这种蓝光， 人们就可以在本质上对中微子进行了解， 进而间接的去了解暗物质， 正是暗物质创造出出来这些中微子。