山杨并不易燃，有利于制造慢速燃烧、不致烧伤手尖的火柴棍。

Aspen isn't very flammable, making for a slow-burning, non-fingertip-singeing matchstick.

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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.

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需要分阶段冷却才能将其运动速度降低，然后进行捕获，形成一个由大约3万个反质子组成的火柴棍那么粗的一个粒子云团。

Several stages of cooling are needed to slow them down before they can be trapped, forming a matchstick-sized cloud of around 30,000 particles.

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