以下为句子列表：
英文: The results indicate that compound (A,B), (A,B) and (A ,B ) are effective extracting reagents for sodium, potassium and caesium, respectively. The cation-selectivity is more effective than the corresponding monocyclic crown ethers.
中文: 果表明双冠醚(A,B)、(A,B)和(A ,B )分别对钠、钾和铯具有较高的萃取能力,其选择性显著优于相应的单冠醚。
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