Graver: V - shaped steel cutting tool used by engravers . Also called burin.雕刻刀: 雕刻铜版用的槽形钢刀.The eighteenth century was the golden age of the English engravers.18世纪是英国雕刻家的黄金时代....
装在起重机上的一块大电磁铁提起破碎机.A large electric magnet on a crane lifts the skull craper.干净的煤送入破碎机和锅炉.The clean coal is sent to a crusher and the boilers.应用手摇破碎机获得的商品核桃仁仅为17%.Recovery of marketable kernels with a hand cracking machi...
See if you can nail the chairman down to an exact date.看你能不能迫使主席把准确日期定下来。The main events were as follows: first,the president’s speech,secondly,the secretary’s report and thirdly,the chairman’s summing-up.主要活动如下:第一项,总裁讲话...