她乏味地向我们详述了她所有的麻烦.She gave us a boring recital of all her troubles.会议单调乏味地持续了近4个小时.The meeting dragged on for nearly four hours.因为数学老师从来不喋喋不休 、 枯燥乏味地为我们讲解,也从来不强迫我们死记硬背.Because the math teacher never nag, boring, for we ne...
溴、氯阳离子化合物的数量受局限.The number of cationic bromine and chlorine compounds is restricted.溴化反应较不易发生.Bromination takes place less readily.溴化烷可以这样形成.Alkyl bromides can be produced this way....