这就是所谓的催化裂化.It is known as catalytic cracking.裂化是使较重的低挥发性的碳氢化合物分裂成较小分子的化学分裂.Cracking involves the chemical breakdown of higher, less volatile hydrocarbons into smaller molecules.FCC(流化催化裂化 ) 是炼厂生产汽油的主要方法之一.The Fluid Catal...
A handful of onlookers stand in the field watching.少数几个旁观者站在现场观看。Steve barely said a handful of words during the first half hour.史蒂夫在前半小时里没说几句话.The band are playing a handful of shows at smaller venues.乐队要在小一点的场馆举办几场演出。...
我蜷缩在地上的某个角落，失声痛哭。I was curled up on the floor in a corner sobbing hysterically.他将地上的树叶全部收了起来。He gathered the leaves up off the ground.母鸡啄食地上的谷粒.The hen ate the grains of corn on the ground....
软颚的下降则是颚舌肌与颚咽肌的作用.The soft palate is depressed by means of the palatoglossus and palatopharyngeus.科学家已经可以使用 高速 摄影技术来计算颚的惊人速度.Scientists were able to measure the amazing jaw speed using high - speed video techniques....