Germs(細菌)areeverywhere.Youcan’tseethem,buttheyareonyour...
問題詳情：Germs(細菌)areeverywhere.Youcan’tseethem,buttheyareonyourdesk,onyourcomputer,andevenintheair!Likepeople,germsmovearoundtheworld.Theyflywithusonplanes.Whenfood,clothes,andotherthingstravelarou...