... axis of rotation of ecliptic ==> 黄道回转轴 axis of rudder ==> 方向舵轴 axis of screw ==> 螺旋轴线 ...
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The pictures of the double-circle target fixed on a jaw rudder surface and parallel to its axis were taken by a stationary digital camera.
用一台位置固定的数码相机对平行于飞机方向舵转轴并固定在该舵面上的一个双圆靶拍照。
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