This article reviewed the synthesis of N-substituted aza crown ethers and their new applications to the field of selective complexation and extraction for metal ions.是什么意思_This article reviewed the synthesis of N-substituted aza crown ethers and their new applications to the field of selective complexation and extraction for metal ions.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句