crown ether的用法和樣例：
例句
- The fragmentation reactions of the saturated urushiol biscrown ether in EIMS are Summu-rized in this paper.
本文總結了飽和漆酚雙冠醚電子電離質譜的裂解規律。 - Solvent extraction using crown compounds as extractants is one of the most important separation methods of cesium.
用冠醚化合物作為萃取劑從酸性廢液中溶劑萃銫，是目前眾多分離手段中最重要的方法之一。
