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1. The NWAC is a group of people who work together to improve the environment.
NWAC是一个致力于改善环境的团体。
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2. The NWAC has been working on this project for several years.
NWAC已经在这个项目中工作了好几年。
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3. The NWAC is responsible for monitoring and reporting on environmental issues.
NWAC负责监测和报告环境问题。