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 prov

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 prov
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

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 prov
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

在选取好长度，宽度，深度，排水量的暂定值后，设计师必须做到重量平衡，他也必须做到力矩的平衡，因为重心在纵向和垂直方向上必须保证足够的平衡和稳性。
几个单词好像错了。
virtical - vertical 垂直方向
grative - gravity 重力

选取出船长、船宽和排水量的初定值后，设计师必须做到船舶重量的平衡。而且还要选一平衡力矩，因为船舶纵向和垂向两者的重心都必须达到满意的吃水差和稳性。