In China, writing brushes, ink sticks, paper and ink stones are called the Four Treasures of Study.
在中国，毛笔、墨、纸和砚台被称为文房四宝。
2
The Great Wall of China is a series of walls made of stones, bricks, and other materials.
中国长城是由石头、砖和其他材料制成的一道城墙。
3
Currently, the main exports from India to China are mineral products, cotton, chemicals and medicines as well as products of iron and steel, jewelry and precious stones etc.