Howdoyougetacrossari的精选

问题详情：Howdoyougetacrossariver?Abridgeisthebestway.Insomeplaces,therearenobridges.Peopleusetheferry（渡船）.Aferryisaboatthattakespeopleandcarsacrosstheriver.Bothendsofaferrylookthesame.Theferryneverhast...