求翻译：Polyepoxysuccinic acid(PESA) is a kind of contamination free scale inhibitor,which was exploited in the 90 s, last century. It is wildly used as a new product ofscale inhibitor at present for its excellent scale inhibition, biodegradability andunique molecular structure having no hetero-atoms such as nitrogen and phosphorus. In this paper, PESA was synthesized through epcxidation and epoxy breakingpolymerization from the raw material maleic anhydride, which included two steps:The synthesis of epoxysucci...是什么意思？

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