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英语翻译after selecting tentative values of length,bredth ,depth

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英语翻译
after selecting tentative values of length,bredth ,depth and displacement,the designer must achieve a weight balance,he must also select a moment balance,beacause the center of grative in both logitudinal and virtical directions must provide satisfactory trim and stability
After selecting tentative values of length,breadth,depth,draft,and displacement,the designer must achieve a weight balance.He must also select a moment balance because centres of gravity in both longitudinal and vertical directions must provide satisfactory trim and stability.Additionally,he must estimate the shaft horsepower required for the specified speed; this determines the weight of machinery.The strength of the hull must be adequate for the service intended,detailed scantlings (frame dimensions and plate thicknesses ) can be obtained from the rules of the classification society.These scantings determine the requisite weight of hull steel.
完整是这样的
选择后的长度,宽度,深度和位移暂定值,设计者必须达到体重的平衡,他还必须选择一个力矩平衡,东阳两纵和垂直的grative中心方向必须提供令人满意的装饰与稳定
bredth?我猜是breadth
virtical我猜是vertical
grative就不知道了你要么再改改吧