The talk upstairs was so long that I was exhausted after listening to it. Let me say it briefly. Composite floor is harmful, but ceramic tile is less harmful. The harm of composite floor mainly lies in the volatilization of harmful substances, which causes harm to human body. The more informal enterprises use poor raw materials to reduce costs, the greater the concentration of volatile substances in the air, and the greatest harm. The harm of ceramic tile lies in radiation. The whiter the radiation, the greater the radiation, whether it is a first-line brand or a third-line brand. Therefore, buying tiles, especially floor tiles, does not make much difference. The difference between big first-line brands and small third-line brands is not product harm, but quality. Maybe the first-line brand will break one piece if it buys one hundred pieces, and the third-line brand will break four pieces. Looking back, if the floor is solid wood, it is best not to compound it. Solid wood is safer than composite. If you want to buy compound interest, you must buy a big brand, otherwise it will do great harm.