But many countries do not have public air quality measurement systems.

但许多国家没有公共空气质量测量系统。

So despite my sketchy measurement system we're just gonna assume that these are accurate enough.

因此，尽管我的测量系统很粗略，但我们只是假设这些系统足够准确。

But at its root there's always been a problem, a measurement system tied to physical objects will only ever be as precise as those physical objects.

但从根本上说，有一个问题，一个与物理物体相连的测量系统只会和那些物理物体一样精确。