Ethylene and trans - dichloroethylene are both inactive in the infra - red in this region.乙烯和反式二氯乙烯在红外光谱的这个区域都无活性.Plasma - polymerization of ethylene gives films of complex, uncertain structure.乙烯的等离子聚合得到复杂的, 无固定结构的薄膜.In...
This dictionary does not give etymologies.这部词典不介绍词源.Dictionaries are still good for obscure usages and etymologies.字典依然擅长于不常用的用法和词源.The branch of linguistics that deals with etymologies.词源学有关词源的一门语言学分支....
Children at school receive coloured stars for work well done.学校里的孩子表现得好会得到彩色星星。She went to New York to receive the award in person.她亲自前往纽约领奖。When we are off sick, we only receive half pay.我们请病假的时候只能拿一半薪水。...