甲烷和丙烷是烷烃。Methane and propane are alkanes.某碳氢化合物已知可能是烯烃或是烷烃.A hydrocarbon was known to be either an alkene or alkane.直链烷烃使机器的 “ 爆震 ” 问题更加严重.The straight - chain alkanes exacerbate the problem of engine " knock "....
那所教师培训学院为该学院的创立者立了一块纪念牌匾。The teacher training college put up a plaque to the college's founder.学院的老师们抱怨说他们的学生还很不适应大学的课业。Faculty members complain that their students are unprepared to do college-level work.他获得了普拉特艺术学...