goup

The homologs of benzene are those containing a alkyl goup or alkyl groups in place of one or more hydrogen atoms.

苯的同那些苯环上含有单烷基（取代一个氢）或多烷基（取代多个氢）的质

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于美国公立学校的意见。