这本敏感的书谨慎、简洁地讨论了收养这一微妙问题。This sensitive book tackles the delicate issue of adoption with care and simplicity." 我们现在的防御工事距离市区只有一英里远."兰德尔队长简洁地说." Our present fortifications are only a mile from town,'said Captain Randa...
The hydrogenation can be controlled to produce any degree of hardness desired in the product.为了生产所需要的任何硬度的产品,可对氢作用加以控制.Its hydrogenation activity in aromatics saturation and ring opening activity were investigated.芳烃加氢饱和...