It takes a while, as you walk around the streets of Nantes, a city of half a million people on the banks of the Loire River, to realize just what it is that is odd.

• 位于卢瓦尔河畔的南特，是个拥有50万人口的城市。漫步街头，你可能一时意识不到，它的奇怪之处在哪里。接着你就明白了：这里有空着的停车位。