一束质子撞击在一个固定靶上，制造出一群散射而出，且在几分之一秒之后就会衰变成中微子的介子。
A bunch of protons smash into a fixed target, creating a horde of scattered mesons, which last for fractions of a second before decaying into neutrinos.
大多数被创造出来的新元素在衰变以前只能存在十亿分之一秒。
Most of the new elements that get created like this last billionths of a second before they disintegrate.
这些粒子中的一部分是稳定的并且构成了普通物质，其它的只存在一秒钟的几分之一，然后衰变为稳定粒子。
Some of these particles are stable and form the normal matter, the others live for fractions of a second and then decay to the stable ones.
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