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【参考翻译】截止到2016年，美国所有生产商销售的汽车都必须确保平均每升汽油行程17千米，SUV和载客车每升汽油行程13千米。
【结构分析】selling vehicles现在分词短语做后置定语。
while连接两个并列的成分，两种不同的车型的标准。
average动词。This month I average 10 hours of work a day in order to finish the project. 为了完成这个项目，我这个月平均每天工作10小时。
2. The Speaker Michael Martin was accused of blocking reforms to the expenses system under which many MPs were revealed to have made excessive claims.
【参考翻译】发言人Michael Martin被指妨碍费用体系改革，导致许多议员被披露过度报销。
【结构分析】介词和关系代词共同引导定语从句。例句：They support the cables from which the bridge has been suspended.”“He described it as 'a very agreeable situation located within two small hills in the midst of which flowed a great river.”
3.Sri Lankan television has shown pictures of what appears to be the body of the Tamil Tiger leader Velupillai Prabhakaran dressed in camouflage uniform.
【参考翻译】斯里兰卡电视台公布了疑似塔米尔猛虎组织领袖Velupillai Prabhakaran的尸体照片，照片显示其身着伪装。
【结构分析】what appears to be……是介词的宾语从句。
dressed in camouflage uniform是过去分词短语做后置定语，修饰leader。