September was crisping the Berlin air and yellowing the leaves when Pug got back.帕格回去的时候,柏林的九月空气清新,树叶正在变黄.None the less was she offended, as a flower by a crisping wind.虽说如此,她仍旧很生气, 就象花朵碰上冷风一样....
MgO改性提高对二乙苯选择性最为明显.Silylation, P modification and MgO modification can improve p - DEB selectivity greatly.指出高效、节能的分子筛吸附分离法是分离二乙苯的最佳选择.The best choice for separating diethylbenzene is the adsorptive separation by zeolite...
Gannets are denizens of the open ocean.鲣鸟栖息在外海地区。polar bears, denizens of the frozen north北极熊，在冰天雪地的北方生活的动物At length these denizens of the swamps disappeared in their turn.到了后来,连这些沼泽国的居民们也不见了....