Rollercoastersarefastandexciting.Butpassingapainfulkidn...
問題詳情：Rollercoastersarefastandexciting.Butpassingapainfulkidney(腎)stonesisnot.Theprocessispainfulandcantakealongtime.ButAmericanresearchershavefoundthatarollercoasterridejustmighthelpthosesuffering...