专家说，由于海浪一波接一波地冲击时与海岸之间产生复杂的相互作用，海啸的影响大小存在很大变数。
Because of the complicated interactions with the coast as wave after wave strikes, experts said the impact of a tsunami can be highly variable.
当您希望单一变数能够存放几种相关资讯时，结构就能发挥相当的作用。
Structures are useful when you want a single variable to hold several related pieces of information.
表现该系统的特性，确定主要子系统模型和及其相互作用，选取重要的设计变数，目标函数和约束。
Characterize the system, identifying important subsystem models and interactions, selecting important design variables, the objective function and constraints.
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