separation of niche

例句：

1. 1.The two countries have been at a state of permanent separation since the war.
   自战争以来，两国一直处于永久分离的状态。
2. 2.The scientists are working on a new method to separate different types of oil from the same mixture.
   科学家们正在研究一种新的方法，用于从同一混合物中分离出不同类型的油。
3. 3.The government has announced plans to separate the city's poor and rich areas.
   政府宣布了一项计划，旨在将城市的贫富地区分开。