英语翻译

Teenagershaveanewshapethesedays.Theyareabout20poundsheavierthantheywere60yearsago.Theyareaboutfourinchestaller,too.ThesefactscomefromJ.M.Tanner,aprofessorinEngland.

J.M.Tannerhasbeenmeasuringpeoplefromallovertheworld.Hehasalsostudiedpeople'sgrowthrecordsofthepast100years.

"Kidstodayarebiggerthaneverbefore,"hesays."Today'snine-year-oldslooklikeeleven-year-oldsbackin1900."

AccordingtoTanner,adultsalsoaretallerthaneverbefore.Butthebiggestchangecanbeseeninyoungpeople.That'sbecauseboysusedtokeepongrowinguntiltheyreachedage26.Buttodaytheystopgrowingat18or19.Mostgirlsstopgrowingevenearlier.Sotoday'steenagersarebiggerthan26-year-oldswere60yearsago.

Whatiscausingthischange?ProfessorTannersaysit'sproperfood.Agooddietalonecannotmakeyougrowbeyondyournaturallimits.Yourfinalheightispartlycausedbytheheightofyourparentsandgrandparents.Buteatingproperfoodcanhelpyoureachyourfinalheight--andreachitearlyinlife.

Willpeoplekeepongettingbigger?Willwehavearaceofgiants?NO--atleastnotiftheU.S.isanexample.Tannersaysthatwehaveeatenproperfoodforyears,andourgrowthratehasalreadybeguntoleveloff.