假定我们有某种放射性原子，它们以一定的几率衰变。

Suppose we've got some sort of radioactive atom, which has a certain chance of decaying.

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气流携带着这些放射性原子，将其分散到全世界。

Air currents caught these atoms and then distributed them around the world.

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放射性原子本身能嬗变为性质完全不同的另一种原子。

A radioactive atom could transmute itself into an entirely different kind of atom.

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Suppose we've got some sort of radioactive atom, which has a certain chance of decaying.

假定我们有某种放射性原子,它们以一定的几率衰变

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