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矿泉水瓶的底部都有一个带箭头的三角型,三角型里面有一个数字。塑料瓶里面含一种叫做PET的塑料材质,用一次是安全的,如果你重复使用,就有致癌危机。
The bottom of the bottle has a triangle with an arrowhead and a number inside the triangle. Plastic bottles contain a plastic material called PET, used once is safe, if you re-use, there is a carcinogenic crisis.