Make sure it's clean river sand, not beach sand.

确保那是干净河沙，不是海滩的沙子。

River sand is into magnetic separation system.

河沙则转入磁选系统。

Swallow has been pursuit, to draw international river sand.

海燕已寻踪，到画溪沙际。

The industry waste slag fly ash or the river sand is used as the siliceous material.

工业废渣粉煤灰或河砂一般被用来作为硅质材料。

With the rising price of steel, iron profit space choose river sand increased greatly.

随着钢材价格的不断攀升，河沙选铁的利润空间大幅提升。