crown ether的用法和样例：
例句
- The fragmentation reactions of the saturated urushiol biscrown ether in EIMS are Summu-rized in this paper.
本文总结了饱和漆酚双冠醚电子电离质谱的裂解规律。 - Solvent extraction using crown compounds as extractants is one of the most important separation methods of cesium.
用冠醚化合物作为萃取剂从酸性废液中溶剂萃铯，是目前众多分离手段中最重要的方法之一。
