摘要： Due to the instability of the monsoon, floods and droughts are frequent in South Asia, resulting in severe soil erosion. Every year, South Asia suffer 阅读全文

摘要： What is fish-scale pits? Fish scales in a semicircular, crescent-shaped pit It is built on a hillside and can often be seen on the slope of the tunnel 阅读全文

摘要： China's soil erosion area has expanded to 1.5 million square kilometers, accounting for about one-sixth of China's total, and 5 billion tons of soil a 阅读全文