What are seen as electrons, muons, top quarks, bottom quarks and so on are actually different faces of the same underlying entity.

电子、介子、顶夸克、底夸克等等，实际上是同一底层实体的不同面孔。

One is the top quark, the heaviest of the lot, of which only a few hundred had been made before the lhc was built.

一个是顶夸克， 是最重的，在大型强子对撞机建成之前只制造了几百个。