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...