ROLL is the instantaneous value of the angle between the reference plane and the horizontal, measured in an athwartship vertical plane.
横摇以从左到右通过舰身的垂直面，
考面与水平面之间所形成的即
角。
ROLL is the instantaneous value of the angle between the reference plane and the horizontal, measured in an athwartship vertical plane.
横摇以从左到右通过舰身的垂直面，考面与水平面之间所形成的即角。
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