Its molecular structure is made up of a five member, unsaturated lactone ring with two hydroxyl groups.
其分子结构是由五个成员国，不饱和内酯环两个羟基。
Design of structure member includes two parts: calculation design and constitution design, constitution design plays very important role in design of structure member to some degree.
结构构件的设计包括计算设计和构造设计两个部分，在某种程度上构造设计对于结构构件的设计起到至关重要的作用。
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