A new scientific study has revealed that there are an average of 9000 different species of microbes in house dust.

一项新的科学研究发现家具灰尘中含9000种细菌。

Even more disagreeable is the fact that, along with ordinary house dust, we breathe in their feces, which contains enzymes called proteases.

更让人难以接受的是，同普通家庭灰尘一道，我们吸入了“尘螨”的粪便，它的粪便中含有蛋白酶。

The goal of every standard is to quantify something about the world, something important that's usually pretty hard to measure, (vacuuming noise) like house dust.

每个标准的目标都是量化世界上的某些事物，一些通常很难测量的重要事物，（消除噪音）， 例如房屋灰尘。