the total value of industrial output

例句：

1. 1. The total number of students in the class is 30.
   班级里总共有30名学生。
2. 2. The total cost of the project was $50,000.
   这个项目的总成本是5万美元。
3. 3. The total area covered by the road is 10 kilometers.
   这条道路覆盖的总面积是10公里。