Now and then they heard the roar of a heavy truck.他们不时地听到大卡车的轰鸣声。A variety of heavy industries grew up alongside the port.各种重工业沿着港口逐渐发展起来。...a sharp short-lived storm with heavy hail.一阵短暂的大雹暴We can not make heavy concess...
And then, unaccountably, she giggled.接着，她莫名其妙地咯咯笑了起来。"I beg your pardon?" she giggled.“您可以重复一遍吗？”她咯咯地笑着说。The girls giggled at the joke.女孩子们让这笑话逗得咯咯笑。...
The organic compounds are mainly benzoic acid anhydride , benzophenone, and so on.生成的有机化合物成分比较复杂,主要成分有苯甲酸酐、苯甲酮等.The uses and synthetic methods on 2,4 - Dichloro - 5 - Fluoro - benzoic acid were described in detail.简要概述了2...