preservation of pure state

例句：

1. 1. The government has implemented strict measuresto preserve the environment.
   政府已经实施了严格的措施来保护环境。
2. 2. Thescientist is dedicated to preserving endangered species.
   这位科学家致力于保护濒危物种。
3. 3. Themuseum exhibits artifacts that havebeen preserved for centuries.
   博物馆展出的文物被保存了几个世纪。