这句话怎么安排合适First,Four issues--the structural characteristics,the methods of extraction and isolation,the physical and chemical properties and structural identifications—are been studied of various chemical components and active cons

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这句话怎么安排合适First,Four issues--the structural characteristics,the methods of extraction and isolation,the physical and chemical properties and structural identifications—are been studied of various chemical components and active cons
这句话怎么安排合适
First,Four issues--the structural characteristics,the methods of extraction and isolation,the physical and chemical properties and structural identifications—are been studied of various chemical components and active constituents from natural products
of various chemical components and active constituents from natural products是Four issues的定语

这句话怎么安排合适First,Four issues--the structural characteristics,the methods of extraction and isolation,the physical and chemical properties and structural identifications—are been studied of various chemical components and active cons
First,Four issues of various chemical components and active constituents from natural products ,the structural characteristics,the methods of extraction and isolation,the physical and chemical properties and structural identifications,are being studied