简介:MrSmithwasillandhewenttoseeadoctor.Thedoctoraskedhimtoputouthistongue(舌头),andthenhesaid,“OK.Youcanputyourtonguebacknow.There’snothingwrongwithyou,butI’mafraidyouhaveaproblem:youseldomtakeexercise.”。“But,doctor.”MrSmithsaid,“Idon’tthinkso.”“Don’ttellmewhatyouthink,“thedoctorsaid.“Iknowwhatyonneed.