What do you mean it's cloudy in hell?

Cloudy in the underworld is mainly cloudy, with occasional cloudy in the middle.

Introduction to meteorological terms:

1. cloudy day: in the sky, the total amount of low clouds is 8/ 10 or above, and the sun rarely or cannot penetrate through the clouds, so the sky is dark.

2. Meteorological cloud amount means that the cloud amount in the sky accounts for four-tenths to eight-tenths of the sky.

3. Be careful of ultraviolet rays when you are active in cloudy weather. Ultraviolet ray is the general name of radiation with the wavelength from 10 nm to 400 nm in the electromagnetic spectrum, which can't be detected by human eyes, but too much ultraviolet ray may harm eyes.

In cloudy summer, people should not forget to protect their sensitive eyes, because some ultraviolet rays can still reach the surface through the clouds, and if they are exposed to these ultraviolet rays for a long time, they may do some harm to their eyes.