It had dawned upon me that I have never placed a proper valuation upon womankind.我这才觉得,我一向不曾对女性给以应有的估价.The next day dawned sombre and gloomy.第二天拂晓时，天色阴沉昏暗。The morning dawned fresh and clear after the storm at night.夜里暴风雨...
Adamantane and bicyclo ( 222 ) octane are predominantly Chlorinated at the bridge heads by this procedure.金刚烷和二环〔222〕辛烷主要是按照这个程序在桥头氯化.Using tendo - tetrahydrodicyclopentadiene as raw material and AlCl _ 3 - trace water s...