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Germs(细菌)areeverywhere.Youcan’tseethem,buttheyareonyour...
问题详情:Germs(细菌)areeverywhere.Youcan’tseethem,buttheyareonyourdesk,onyourcomputer,andevenintheair!Likepeople,germsmovearoundtheworld.Theyflywithusonplanes.Whenfood,clothes,andotherthingstravelarou...