It is hard to make out what criteria are used.很难弄清楚使用的是什么样的标准。Each of us will have our own criteria for success.每个人对于成功都有自己的标准。Her criteria defy analysis.她的标准让人搞不明白。...
此反应属分子内反应,因而快速且干净利索.The reaction is intramolecular and hence fast and clean.该体系合成的丁苯共聚物具有均匀的分子内和分子间分布.The prepared random SBR has uniform inter ? and intramolecular composition distribution.构象的变化改变了分子内的螺旋方向,因此,旋光方向随之改变.S...