Severe steric effects at the reactive carbon would impede the substitution.大的立体效应阻止在碳上的取代.It was intended to impede the apprehension of the person.它旨在妨碍对该人的拘押的.They also impede backmixing of sand.同时也可防止砂子的返混....
It was intended to impede the apprehension of the person.它旨在妨碍对该人的拘押的.They also impede backmixing of sand.同时也可防止砂子的返混.At no time did I make an attempt to impede any investigatory effort.我绝没有试图妨碍过任何调查工作。Severe steric effe...
MFM is an effective method to study magnetic domains and research magnetic materials.本文利用磁力显微镜研究纳米尺度磁畴的检测方法.Spacers make your child's inhaler easier to use and more effective.储药罐可以简化孩子用药,因此更为有效.Recent studies sugges...
上面有厚厚一层泡沫的一杯啤酒a glass of beer with a good head of foam上面有厚厚一层泡沫的一杯啤酒a glass of beer with thick froth on top台伯河已不再是漫溢平原的泛起泡沫的急流.The river Tiber was no longer a foaming torrent overflowing the plains....