ROLL is the instantaneous value of the angle between the reference plane and the horizontal, measured in an athwartship vertical plane.
横摇
到右通过舰身的垂直面，量度参考面与水平面之间所形成的即时角度。
ROLL is the instantaneous value of the angle between the reference plane and the horizontal, measured in an athwartship vertical plane.
横摇到右通过舰身的垂直面，量度参考面与水平面之间所形成的即时角度。
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