To keep the design of floating Bridges safe and economical, a relatively precise evaluation on the Bridges' loading capacity and strength is necessary.
为了使浮桥的设计既安全又经济，就必须对浮桥的载荷和强度有一个比较精确的评估。
To keep the design of floating Bridges safe and economical, a relatively precise evaluation on the Bridges' loading capacity and strength is necessary.
为了使浮桥的设计既安全又经济，就必须对浮桥的载荷和强度有一个比较精确的评估。
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