他们依然很熟悉伦敦市郊的喧闹声。Their ears were still attuned to the sounds of the London suburb.罗斯听到了熟悉的声音，但没注意听说的是什么。Rose heard the familiar voice, but tuned out the words.她在自己熟悉的领域里对自己的行为有十足的把握。On her own ground she knows exactly wha...
I need to get to Lyon by nightfall...我需要在黄昏前到达里昂。I started work at dawn and returned only at nightfall.我披星戴月地工作。I need to get to Lyon by nightfall.我需要在黄昏前到达里昂。They were trying to make New Orleans by nightfall.他们力图在黄昏前赶到新...
介绍了丙二酰氧基硼氢化钾的制备及其原位与烯烃的选择性硼氢化.The preparation of potassium malonyloxyborohydride in situ and its selective hydroboration alkene are described.叙述了丙二酰氧基硼氢化钠的制备及其原位与烯烃的选择性硼氢化反应.The preparation of sodium malonyloxyborohydrid...