across country idiom
UK乡间旅游（在一些没有大路和公共交通设施的地方旅游）
travelling in a direction where roads or public transport do not go, or where main roads or railways do not go
Getting a train across country from Cambridge to Chester can be difficult. 搭乘火车在剑桥和切斯特之间进行乡间旅行可不容易。