By the time it gets to Gran Sasso the beam has fanned out, and big though it is, Opera only sees neutrinos from part of the beam.
当它到达格兰·萨索的时候粒子束已经发散了，尽管Opera很大，它也只能看见部分粒子束产生的中微子。
By the time it gets to Gran Sasso the beam has fanned out, and big though it is, Opera only sees neutrinos from part of the beam.
当它到达格兰·萨索的时候粒子束已经发散了，尽管Opera很大，它也只能看见部分粒子束产生的中微子。
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