单词	phthalic anhydride
释义	phthalic anhydride noun : a crystalline cyclic acid anhydride C8H4O3 used especially in making alkyd resins Word History First Known Use 1855, in the meaning defined above Medical Definition phthalic anhydride noun : a crystalline cyclic acid anhydride C8H4O3 that is used especially in making alkyd resins and is a structural part of thalidomide
随便看	double consonant double contraoctave double contrast enema double corner double counterpoint double couplers double cream double crosses double dagger double dash double date Double Daylight Saving Time double descent double detection Double Diapason double digits double door double doors double dot double down double dribble double drift double drum double drummer double dummy

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