The research of copolymerization of ethylene and diolefin has theory value as well as practical significance.乙烯和共扼二烯烃的共聚合的研究不仅具有理论价值而且还有实际意义.In addition, the copolymerization of conjugated diolefin is the base to explore...
对于学校松弛的纪律她感到震惊.She was shocked at the slack discipline in the school.每天只锻炼20分钟，即使最松弛的臀部也会变挺翘。Exercise for just 20 minutes a day to firm up even the saggiest bottom.松弛的线容易纠缠在一起.Loose string is easily entangled....