A hydrocarbon was known to be either an alkene or alkane.某碳氢化合物已知可能是烯烃或是烷烃.The hydrocarbon must be an alkene.这个碳氢化合物必定是烯烃.The betaine will collapse to the alkene only when these two functions are eclipsed.只有当这两个基团移至重迭位置时...
屋檐下挂着冰凌。There were icicles hanging from the eaves.在屋檐下筑巢的鸟birds nesting under the eaves燕子正在我们的屋檐下筑巢.The swallows are building a nest under the roof of our house....
Thus this chapter surveys the art of fluidization today.因此,本章对当今流态化技术作一概述.These initial successes spawned much interest in fluidization.这些初始的成功引起对流态化的很大兴趣.Fluidization has had a rather turbulent history.流态化的发展历史是颇不平坦的....