The two candidates are much of a muchness—it's hard to choose between them.

两位候选人不相上下—很难挑选。

They are all much of a muchness.

他们都是大同小异的。

John and Robert dressed much of a muchness.

约翰和罗伯特穿着大同小异。

It's hard to choose between the two candidates: they're both much of a muchness.

很难在这两个候选人中作选择；他们俩不分上下。