This is a valley in the abyss, in a cold and biting ice and snow, a large mass of deep and shallow blue-white flames are burning, as if burning out the bravado of life, every moment there is a flame dimly extinguished, and every moment there is a new one. The birth of the flame began to struggle and sway in the water, and life and death were reincarnated in alternation, which was fully embodied in the small side of the world.

"Old Wu, then, what is that?" , The bamboo pole stared at the blue-white flames, and thought carefully.

Wu Tiansheng explained unhurriedly: "It is a ghost fire, also known as a "phosphorus fire", which appears in the grave more often than dry days in summer. Because human bones contain phosphorus, after the corpse decomposes, it will produce phosphine, which has a very low ignition point and can spontaneously combust. When walking, it will move behind it, and if you look back, it is very scary, so it is called "ghost fire" by those who are timid or superstitious. The color of the ghost fire changes depending on the color of the elements contained in the human body. There are three colors of ghost fire that we can see from time to time: green, blue, and red, and if there is a special color, it means that the dead person has a lot of trace elements in the body. ”

The bamboo pole smiled bitterly: "So that's the case, that... There's no need for us to continue for the time being, if we're haunted by ghosts, but..."

Professor Sun was so tired that he sat directly on the ground and said: "Okay, the big guy must not have the heart to go on anymore after being tossed like this, now that the moon is in the sky, the whole forest is black, and it is not easy to walk, I think it is better for everyone to stay in place and rest for a night, it is now 1 o'clock in the morning, I will wake you up at 7 o'clock." ”

"That's it, let's all rest and rest."

There seems to be a foggy river in the whole forest, and the sound of pine waves can't stop whining, and the light boat turns around, and it has passed the Wanzhong Mountain. The mountains and valleys were covered with milky white mist, which enveloped them and adorned them with a white coat. The milky white mist, overflowing in the valley one by one, slowly overflowed up the hillside, scattered into a soft tulle, fluttering and flickering, making people feel like they were about to return to the clouds.

The bamboo pole snores and sleeps more soundly than anyone else. Wu Tiansheng slept on one of his hands, looking at the night sky as always, unable to sleep. There are so many facts that have happened in the past few days that it is difficult to accept for a while. He carefully recalled Professor Sun's words and deeds, from the initial skepticism to the halfway belief and then to the current skepticism. Professor Sun's words really frightened Wu Tiansheng, in his eyes, Professor Sun is definitely not a good professor who only does his duty, and there must be a ghost in his heart!

"You haven't slept yet, have you?" , Professor Sun suddenly appeared in front of him.

Wu Tiansheng was frightened, and hurriedly got up and prepared to exhale with a fist.

"It turned out to be Professor Sun, didn't you sleep too?"

Professor Sun scoffed, "What? Scared? Am I that scary? ”

"No, I'm thinking about something, I didn't notice you, I don't mean anything else, don't take it to heart."

"Hahaha, it's funny, you think about it slowly, I just got up and went to the toilet, now go to sleep, you also rest early, thanks to you these days, if it weren't for you, my old bones, I really can't do anything.".

Wu Tiansheng looked at Professor Sun meaningfully, and felt more and more that he had a ghost in his heart, and after thinking about it, he fell asleep in a daze.

The fog gradually melted and faded. At the foot of the mountain, a fresh breeze drifted faintly, and it was already 7 o'clock in the morning, but the sky was not yet light. When Professor Sun was about to wake them up one by one, he found that Lin Jia couldn't wake them up no matter how much he screamed.