反氢（antihydrogen）是对应元素氢的反物质：每颗氢原子是由一颗质子及电子组成，而反氢则是由一颗反质子及正电子组成。
例如，任何违反氢和反氢之间对称的期望会动摇物理学的核心。
For example, any violation of the expected symmetry between hydrogen and antihydrogen would rock physics to its core.
反氢和氢原子应该有相同的特性，例如发出光的频率一模一样。
Antihydrogen and hydrogen atoms should have the same properties, emitting the exact same frequencies of light, for example.
他们在春天说，他们希望产生一束反氢激光制造出原子光谱的初步测量器以便它能与常态的氢相比较。
They say that in the spring, they hope to train a laser on the antihydrogen to make a preliminary measurement of the atom's spectrum so that it can be compared to regular hydrogen.
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