backwater
/ˈbækwɔːtə(r)/noun
1- a part of a river not reached by the current, where the water is stagnant死水。
1.1
- an isolated or peaceful place隐蔽之处。
1.2
- a place or condition in which no development or progress is taking place落后地区; 停滞状态：
the country remained an economic backwater.
该国经济仍然停滞不前, 一潭死水。