sanitary protection zone

例句：

1. 1. The city government has established a sanitary protection zone around the river to prevent pollution.
   市政府已经为这条河流周围建立了一个卫生保护区，以防止污染。
2. 2. The sanitation department is responsible for maintaining the sanitary protection zone.
   卫生部门负责维护卫生保护区。
3. 3. The construction of the new highway will not affect the existing sanitary protection zone.
   新高速公路的建设不会影响现有的卫生保护区。