variable discharge permit

例句：

1. 1. The company needs to obtain a variable emission permit before starting the new project.
   公司在开始新项目之前需要获得一个可变排放许可证。
2. 2. The environmental agency issued a variable emission permit for the construction site.
   环境机构为该建设地点颁发了一个可变排放许可证。
3. 3. The factory has been granted a variable emission permit by the government.
   该工厂已获得政府颁发的可变排放许可证。