It means, cover, obstacles, can't see clearly. Morality is a troublesome thing. Symbol, the future is gloomy and not bright.
Generally speaking, clouds cover mountains and hover upward, which means that things are covered or hindered, so that people can't see the essence.
Fog, pronounced W u, was first seen in Oracle Bone Inscriptions and belongs to pictophonetic characters in Liu Shu. The basic meaning of "fog" is that water vapor close to the ground floats in the air after cold condensation, such as fog; It means something like fog, such as smoke.
In daily use, "fog" is also often used as an adjective, meaning light and thin, such as fog yarn (like mist).
The difference between fog and smoke:
Cloud and mist, pronounced as yúnwù, is a Chinese word, which means cloud and fog. It is more like being covered by something, which makes people unable to see the essence of things clearly. Ba Jin's Travels of Building Chongqing Road Miscellaneous Notes: "The car goes to the top of the mountain, and there are clouds around it? When I got down from the mountain, I looked up and saw clouds all over the mountain. "
Smoke generally refers to smoke, fog, clouds, gas, etc. Smoke filled the earth. Tang Du Fu's "Li Jianzhai" poem 1: "China is tingchun, high city is smoky."
Related examples
1. The smoke in Beishan is boundless, and the frost in Nanjin is gray.
2. Smoke rises above the leaves.
The classroom was filled with smoke in an instant.