This fixture should be provided with a reference leveling surface, so that it can be kept level as the balance deflects. 這種裝置應該有一個水平基準面，以便在天平變形時能夠使之保持水平。
ROLL is the instantaneous value of the angle between the reference plane and the horizontal, measured in an athwartship vertical plane. 橫搖以從左到右通過艦身的垂直面，量度參考面與水平面之間所形成的即時角度。
The area can easily be worked out if you know the length and the breadth. 如果你知道長度和寬度的話，計算面積就很容易了。
The modeling region is optimized by directly reducing the calculating area using FDTD subdomains-synthesized method. 該法通過直接減小計算面積從而優化建模區域。
