Say hello to him and say "welcome". After entering the trading page, he said: Pick a few convenient strangers. Sell things to upgrade. He said: the leaves are black, 3Q, and when you buy something, you change it for something different. For example, buy a rocket launcher, "Don't doubt it, stranger, I'll sell it if you can afford it." If you buy a gun and an egg pain treatment instrument, he will say, "buy this thing." You know what I mean. " Everything else is similar: "Are you sure". If you don't have enough money, that's all he will say. If you exit the trading page, just say, "Come back later."