Poly ( vinyl alcohol ) has been protected against radiation by benzalation and benzoylation.聚乙烯醇 的耐辐解可通地苄叉化和苯甲酰化提高.Poly alcohol has been protected against radiation by benzalation and benzoylation.聚乙烯醇的耐辐解可通过苄叉化和苯甲酰化提高.M...
By all accounts, Rodger would appear to be a fine fellow.据说，罗杰是个好小伙。He was a tall, thin fellow with a slight stoop.他是个瘦高个儿，有点驼背。Eddie was a short squat fellow in his forties with thinning hair.埃迪四十多岁，矮矮胖胖的，头发日渐稀疏。...
There was a slackening of western output during the 1930s.20世纪30年代西部的产出有所减少。Wang replied without slackening his pace.王三毛一边回答,一边只顾走.Indeed, its idea was slackening in New England by the early eighteeth century.其实, 到了十八世纪初...