The canoe is made from an impermeable wood.独木舟由防水木头制成。The external layer of the skin is relatively impermeable to water.皮肤的外层不透水.impermeable by water .不透水的Thus clays and shales tend to be impermeable.因此粘土和页岩就往往不透水....
The receiver and the quarterback are going to trade positions.接球手与四分卫将会对换位置。The management will have to think seriously about their positions.管理层将不得不认真考虑他们的立场。Some, I suppose, might even be in positions to influence opin...
We have compared in vitro binding of adriamycin ( ADR ) and amsacrine ( AMSA )研究了阿霉素 ( ADR ) 和安吖啶 ( AMSA ) 与小牛胸腺DNA结合 成复合物的药理特性.ADR与DNA的 结合强度约相当AMSA的 100倍.Adriamycin can selectively kill perikaryon by way of retrograde a...