The catalysts and processes for conversion of aromaticswere reviewed , especially those for catalytic hydrodealkylation and transalkylation. 重点阐述了催化加氢脱烷基和烷基转移反应特点和有关催化剂的研究以及国内外主要工艺发展现状.
在暴风雨中,我们不得不把货物紧系在船的甲板上.We had to lash the cargo to the ship's deck during the storm.他把这根铁丝紧系在金属圈上.He made the wire fast to the metal ring.他把这根绳子紧系在金属圈上.He made the rope fast to the metal ring....
They signaled which way one is going to turn.他们打信号示意走哪一条路.Jim signaled his helplessness to Mary to leave the party.吉姆无法从宴会脱身时,他向玛丽使了个眼色,表示无可奈何.He signaled the waiter to bring the menu.他作手势要侍者拿菜单来....
他眼睛直视前方，加速超过了前面一辆慢吞吞行进的大卡车。He looked straight ahead and overtook a lumbering lorry.卡车倒车和掉头的时候，我听见发动机的轰鸣声。I heard the engines revving as the lorries backed and turned.他们用卡车猛撞大门。They used a lorry to ram the main gate....