Uracil -- a pyrimidine found in RNA that base - pares with adenine.尿嘧啶 -- 核糖核酸中的一种嘧啶,与腺嘌呤形成碱基对.The missile control system composed of two pares, the controller and the controlled object.粗略地看,导弹控制系统都是由控制器和被控对象两大部分组成的....
The natives paddled us over to the other side of the river.当地人划桨送我们到河的对岸.They paddled down the river in a canoe.他们坐在独木舟上向下游划去.The explorers paddled their canoe cautiously upstream.探险者们谨慎地把独木舟向上游划去....
海鸥盘旋在驳船上方，展开空中的搏斗。The seagulls swirled in aerial combat over the barges.在该地区还发现了海鸥的其他亚种。Several other sub-species of gull are found in the region.海鸥嘴里叼着鱼。The gull held the fish in its beak....