亚胺基杂环丙烷季铵盐的阳离子,一定是按协同反应的方式开环的.The aziridinium ions must all be opened by a concerted process.偶氮杂环丙烷是一类重要的 、 环内张力颇大的化合物.The diazirines are interesting , highly strained ring systems.在最佳反应条件下,环丙烷羧酸异丙酯的产率达92%.Under the opti...
He had many motives for wanting to knock off Yvonne.他有很多杀伊冯娜的动机。Yvonne took her customary seat behind her desk.伊冯娜坐在桌子后面那个她常坐的位子上。Yvonne has been giving these kinds of lessons for over a year.伊冯教授这种课程已经有一年多了....
Water in the engine compartment is sucked away by a hose.发动机舱里的水由一条软管抽走。In 1941, the train would have been pulled by a steam engine.1941年，火车本可以由蒸汽机车拉动。Two of them got out to fiddle around with the engine.其中两人下车鼓捣引擎。...
The violence used was horrendous.所使用的暴力骇人听闻。Holidays can be horrendous. All right, I'll rephrase that. The first few days are invariably hell...假期可能会糟糕透顶。好吧，让我换一种说法。最初的几天总是如同炼狱。He described it as the most horrendous...