Heavy water is heavy because the hydrogen in it weighs twice as much as ordinary hydrogen (it has a proton and a neutron in its nucleus, instead of just a proton).

重水之所以重是因为水中氢的重量是普通氢的两倍（它的原子核中有一个质子和一个中子，而不仅仅是一个质子）。

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Deuterium is a heavier and stable isotope of ordinary hydrogen.

氘是普氢较重的、稳定同位素。

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The frequency needed to do this can then be compared with that which flips the spin of an ordinary hydrogen atom.

这些测试的频率将会与翻转普通氢原子的频率作对比。

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They used microwaves to nudge the anti-atoms, to see if they behave when nudged like mirror images of ordinary hydrogen atoms.

ECONOMIST: Are matter and antimatter truly opposites?

Bombard an ordinary hydrogen atom with microwaves of the right frequency and you will lift it out of its ground state by flipping the spin of its electron.

ECONOMIST: Are matter and antimatter truly opposites?

Heavy water is heavy because the hydrogen in it weighs twice as much as ordinary hydrogen (it has a proton and a neutron in its nucleus, instead of just a proton).

ECONOMIST: Longevity