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1.把塑料袋放在水里,用力将其按到水里,稍等片刻,浮出水面的即为无毒塑料袋,沉在水底的即为有毒塑料袋。
1. The plastic bag on the water, forced to press it into the water, wait for a moment, surfaced is non-toxic plastic bags, sinking in the bottom is toxic plastic bags.