传统机身设计要求使用重型结构材料，以便把机身横向重量转移到机翼下方的起落架和机轮上。
Conventional airframes require heavy structural material to transfer the fuselage's weight laterally to landing gear and wheels under the wings.
工程师们已经将树木和骨骼的结构特点融入到软件设计方案中，对设计对象的重量和外观进行优化。
Engineers have incorporated structural design lessons from trees and bones into software design programs for optimizing the weight and performance of materials.
土木工程师建造桥梁和其他结构的数学模型，从而在进入昂贵的实际建设阶段之前计算出所设计的结构能够承受多大的重量和压力。
Civil engineers build mathematical models of Bridges and other structures to calculate how much weight and stress they can bear before committing to an expensive construction phase.
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