C3527

"Of course not." Yan Qingyi said, "After the mud is stuffed into the sack, it will be washed away by the river water. The only thing we can do is to use rocks, they are very heavy, and the river water won't wash away the rocks."

The gunny sack had holes in it. Once the mud was put into the sack and thrown into the water, the mud inside would be washed away by the water