不完全的燃烧和不适当的通风条件能导致乙炔的产生.Incomplete combustion and improper draft conditions can cause ethylene formation.已多次证实火焰中存在聚乙炔.That polyacetylenes are present in flames has been demonstrated many times.这种反应构成了制备芳基环丙基乙炔的有效方法.This...
She stood preening in their midst, delighted with the attention.她得意洋洋地站在他们中间，为受人瞩目而高兴。I greatly esteem your message in the midst of our hard struggle.您在我们奋力抗争时发来的电文让我充满了敬意。Eleanor arrived in the midst of a blizzard.埃莉诺在暴...
克莱尔和戴维·阿斯特正在画远处西班牙山峦的风景素描。Clare and David Astor are sketching a view of far Spanish hills.布赖恩·麦克莱尔头球攻入了自己本赛季第23粒进球。Brian McClair nodded in his twenty-third goal of the season.他在加利福尼亚州的克莱尔蒙特男子学院主修金融专业。He majored in financ...