The Danube kept these two cities apart until 1873, when the first of Budapest's seven bridges began stitching the two halves into one.

多瑙河将这两座城市分隔，直至1873年，布达佩斯七道大桥中的第一道建成两边，才开始二合为一。

The two islands were connected to each other and to the river banks by seven bridges.

这两个岛屿通过七座桥相互连接并与河岸相连。

Which route would allow someone to cross all seven bridges without crossing any of them more than once?

哪条路线可以让某人穿过所有七座桥而无需多次穿过其中任何一座桥？