前线的防务得到后备装甲部队的支援。These front-line defences are backed up by armoured units in reserve.该机构说国际救援机构也提供了支援。The agency says international relief agencies also have pitched in.支援的许诺a pledge of support...
杂原子数越多, 分子被氧化的程度越高.The larger the number of heteroatoms, the more highly oxidized the molecule.关键反应为底物控制的不对称杂原子共轭加成反应.The key step was a substrate controlled asymmetric heteroatom conjugated addition.杂原子烯反应是该反应的重要组成部分.Th...