二酯键是一种化学基团，指一分子磷酸与两个醇（羟基）酯化形成的两个酯键。
当时只能证明rna可以切割和连接磷酸二酯键。
At that time, it had only been demonstrated that RNA could cleave or ligate phosphodiester bonds.
近年来，人类在研究磷酸二酯键水解断裂的化学模拟方面已经取得了很大进展。
In recent years, a great progress has been made in chemical mimic for the hydrolytic cleavage of phosphodiester bond by using bioinorganic methods.
先制备具有均一链长的含有酰胺键的硬段单体，然后与二元醇进行缩聚反应生成酯键是制备性能良好的聚酰胺酯的较好途径。
Ester bond can be formed through the polycondensation of hard segment monomer with uniform segment length containing amide bond and dihydric alcohol, which is a better way to prepare polyesteramide.
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