area and volume period method

例句：

1. 1. The city has a large area of green space.
   这个城市有大量的绿地。
2. 2. The area around the lake is very beautiful.
   湖周围的地区非常美丽。
3. 3.The government plans to expand the area of the city.
   政府计划扩大城市的面积。
4. 1.The book has a large volume.
   这本书有大量内容。
5. 2. The container has a small volume.
   容器的容积很小。
6. 3. The volume of the data is increasing rapidly.
   数据量正在迅速增加。
7. 1.The work was completed in two periods.
   这项工作在两个阶段完成。
8. 2. The company's performance has been in a period of decline.
   公司的经营状况一直在下滑。
9. 3. The research took place over a period of three years.
   这项研究持续了三年。