英语语法分析

A steel railway bridge spans the yalu river.

鸭绿江上有一座钢铁大桥。

The freshwater goby is mainly found in Liao River and Yalu River in Liaoning.

辽宁地区的淡水虎鱼主要分布在辽河和鸭绿江两大河流。

The river-sea dividing marker must be a symbol which separates the Yalu river from the Yellow sea.

江海分界碑，这里就是鸭绿江和黄海分界的标志吧。