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Beofore long, the CCTV journalists reported that the ice used in some of the restaurants in China was 6 times dirtier than the water in toilet. The news aroused heated discussion. The spy bacteria film straw is inpired by the aversive feelings when people see catepillars. When the bacteria number in the liquid in the straw is higher than the national standard, the straw will turn into the texture of catepillar straw, which greatly isolate people from unsafe drink.