这种反应构成了制备芳基环丙基乙炔的有效方法.This sequence constitutes an efficient method for preparing arylcyclopropylacetylenes.环丙烷基硅醚在卤化锌的作用下能够与硅胶反应生成环丙基醇.Trimethylsilyl cyclopropyl others can react with the gel the cyclopropanols when Lew...
早期的天文学家认为我们的星球是宇宙的中心。Early astronomers thought that our planet was the centre of the universe.人类对于宇宙的了解已经大为增加。Mankind's knowledge of the universe has increased beyond measure.宇宙的浩瀚难以捉摸。The immensity of the universe ...
他在前面的草坪上丈量并标记出两个圆圈。He was on the front lawn, measuring out two circles.他准确地丈量了我的花园.He has made an accurate measurement of my garden.他离家乡不过只有几个小时的路程, 但这个差距是无法丈量的.He was only a few hours away from home, but the distance co...
"I can't give you an answer now," he hedged.“我现在不能回答你，”他闪避道。Many reduced fares are hedged around with restrictions.很多优惠费率都带有限制条件。'I can't give you an answer now,' he hedged.“我现在不能回答你，”他闪避道。They hedged...