It's possible that the cleanest and most highly evolved creatures where this topic is concerned are internal parasites, along with bee, wasp and ant larvae.

在这个话题中，最干净、最高度进化的生物可能是体内寄生虫，以及蜜蜂、黄蜂和蚂蚁幼虫。

He wasn't the cleanest fellow.

他绝不是个爱干净的家伙。

Britain was the cleanest.

英国是最廉洁的。

This will be the cleanest coal plant in Europe.

它将是欧洲最洁净的燃煤电厂。

I guess farming is about the cleanest way to make a living.

我觉得经营农场大约是最清洁的一种谋生方式了。