我们穿过城市狭窄的背街小巷，两边的老房子都斑驳褪色了。

We walked through the ___backstreets of the city, where old houses stood with peeling paint.

那部电影揭露了城市后街发生的黑暗交易。

The movie exposes the dark deals happening in the ___backstreets of the city.