gun bore line
... 前进轴线 axis of advance 炮膛轴线 axis of the bore 同盟国操演书刊 AXP ...
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这种瞄准镜底座是可以转动的，使得瞄准线能够偏离炮膛轴线以修正射程，偏流及火炮与目标之间的相对运动。
The sight telescope was mounted in such a way that the line of sight could be offset from the axis of the bore of the gun to correct for range, drift, and relative motion of gun and target.
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