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...
He stood up and went to the window...他起身走向窗户。Clarion calls to liberation had been mocked when we stood by.当我们袖手旁观的时候,自由解放的号角声遭到了嘲弄.In the backroom study stood two desks side by side.在里屋书房里,有两张桌子并排放着.They all stood there ...
The stone steps, dating back to 1855, are beginning to wear.那些可以追溯到1855年的石阶开始出现磨损。They've been dating for three months.他们已约会3个月了。The most frequently used method is radiocarbon dating.最常用的方法是放射性碳定年法。...
The assembly arrogated to itself the right to make changes...大会越权作出变更。She arrogated to herself a certain importance.她妄自尊大.He arrogated the privilege to himself alone.他为自己僭取特权。He suspiciously arrogated bad motives to othe...