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...
With a low-pitched rumbling noise, the propeller began to rotate.伴随着隆隆的低沉噪声，螺旋桨开始旋转起来。The engine turned a propeller.发动机使螺旋桨旋转起来。The freighter fouled its propeller in fishing nets.货船的螺旋桨被渔网缠住了。...
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...