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...
Botanists had some difficulty categorizing the newly found plant.植物学家们不大容易确定这种新发现的植物的种类.Botanists refer this flower to the rose family.植物学家将这花归入蔷薇科.Our botanists try to find out where useful weld plants grow.我们的植物工作者们设法找...
With technological changes many traditional skills have become obsolete.随着技术的革新，许多传统技艺已被淘汰。These goods are obsolete and will not fetch much on the market.这些货品过时了,在市场上卖不了高价.They tried to hammer obsolete ideas into the you...