Ye Cheng thought of the original manufacturing industry in the valley. It's not impossible to have plastic. Just why are so many colloids here?

"You go outside and wait. I'll open the channel and you come in again."

If only plastics are easily burnt out by fire, but the black wall is only softening under the high-temperature flame, there is no sign of dissolution, and a lot of yellowish-green liquid seeps out from the mud, and feels a little sticky in the hand, similar to some chemical composition, Ye Cheng suddenly stops, jumps a few steps away, and keeps a distance from the black wall.

"Hey, what's going on inside?"...