The homologs of benzene are those containing a alkyl goup or alkyl groups in place of one or more hydrogen atoms.
苯的同系物是那些苯环上含有单烷基（取代一个
）
烷基（取代个）的物质
俚〉黏稠液体(如巧克力糖浆)The homologs of benzene are those containing a alkyl goup or alkyl groups in place of one or more hydrogen atoms.
苯的同系物是那些苯环上含有单烷基（取代一个）烷基（取代个）的物质
Each year, the education goup group Phi Delta Kappa and the Gallup organization gather opinions about American public schools.
每年，教育组
费黛奥塔·卡朋和盖洛普组收集关
公立学校的意见。
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