The valley is full of long mist, walking quietly up the mountain alone, like an evil spirit looking for a place to rest and not getting it. Cold fog, sticky, cold, slowly floating. Obviously, the waves are undulating and chasing each other, just like the waves on a dangerous sea. The fog turned off the lights on the car, and nothing could be seen except the fog for a few yards. The polluted air exhaled by tired horses mixed in the fog, as if they had caused all this.