They were made of admiralty gun metal.
它们是海军炮铜制造的。
The hydraulic clay gun is an special metallurgical equipment for open metal iron mouth.
液压泥炮是堵铁口的专用设备，是高炉的重要组成部分。
In 1913 Harry Brearley, a metallurgist, was trying to find a metal suitable for making gun barrels.
哈里布里尔利的冶金家试图发现一种适合做枪管的金属。
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