几十年来，粒子物理学家们用氢原子作为基准衡量质子的大小。
For decades, particle physicists have used the hydrogen atom as a benchmark for measuring the size of protons, which are part of the core of atoms.
为了要建立反氢原子，并且要使它不至于马上湮灭，反氢激光物理装置的研究团队把反质子冷却，并把它们压缩成火柴棍大小的云斑。
To create antihydrogen and keep it from immediately annihilating, the ALPHA team cooled antiprotons and compressed them into a matchstick-size cloud.
然后研究人员推动这个冷却的云斑，并进一步把反质子压缩，以致可以用一个相似大小的中子云来与它相重叠，就在那时，两个粒子（反质子和中子）成对地形成了反氢原子。
Then the researchers nudged this cloud of cold, compressed antiprotons so it overlapped with a like-size positron cloud, where the two particles mated to form antihydrogen.
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