The idea of Yi conceived in the semiotic system and the hexagram & line statements becomes the mainstream in the long river of the history of Chinese culture.
Zhaoyuan section is the frontage of monitoring water quality of Songhua Rivermainstream.
松花江肇源江段是松花江干流水质监测的前哨。
3
The main channel bed will scour if sediment amount from tributary debris is less than that the mainstream can carry and the river evolution exhibits the characteristic of mountainous rivers.