The expansion from the main river.

沿主要河流向两侧呈梯度状扩展。

After that the relative position of cities on main river changed.

后来主要是干流城市相对地位的变化。

Continental Portugal is split in two by its main river, the Tagus (Tejo).

塔霍河(特茹河，Tagus)将葡萄牙分为两部分。

The main river closure is one of key techniques for the Three Gorges Project.

长江三峡工程大江截流是三峡工程的关键技术之一。

River in China, north and south, the main river has a Chinese jade culture and heritage.

在中国大江南北、主要的河流都有中国玉文化的传承。