The street is relatively an unenclosed the area, compared to the parking lot.

与停车场相比，街道是一个相对未封闭的区域。

It's clear we know how it transmits, we don't know how easily it transmits in humans, in communities or in unenclosed areas.

很明显， 我们知道它是如何传播的，但我们不知道它在人类、社区或未封闭区域传播的难易程度。