我们在后街小巷里闲逛，寻找一家隐蔽的书店。

We wandered through the ___back ___streets, looking for a hidden bookshop.

那家古雅的咖啡馆藏匿在一条狭窄的后街上。

The quaint cafe was hidden down a narrow ___back ___street.

我们走了一条小路，以避开高速公路上的拥堵车流。

We took a ___back ___road to avoid the traffic on the motorway.