Rollercoastersarefastandexciting.Butpassingapainfulkidn...
问题详情：Rollercoastersarefastandexciting.Butpassingapainfulkidney(肾)stonesisnot.Theprocessispainfulandcantakealongtime.ButAmericanresearchershavefoundthatarollercoasterridejustmighthelpthosesuffering...