ROLL is the instantaneous value of the angle between the reference plane and the horizontal, measured in an athwartship vertical plane.
横摇以从左到
舰身的垂直面，量度参考面与水平面之间所形
的即
角度。
船的ROLL is the instantaneous value of the angle between the reference plane and the horizontal, measured in an athwartship vertical plane.
横摇以从左到舰身的垂直面，量度参考面与水平面之间所形的即角度。
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