Lookcloselyatyourhands.Aretheyclean?Itdoesn'tmatterhow...
问题详情：Lookcloselyatyourhands.Aretheyclean?Itdoesn'tmatterhowmanytimesyouwashyourhands,tinymicrobes(微生物)stillstayonthem.Butdon'tworry.Mostmicrobesdon'tharmyou.Nowscientistssaythemicrobesonourha...