1、
求解释放荷载过狴中引入虚拟刚度概念，用以摸拟拉伸硬化效应。
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2、
a persistent current-account surplus is a symptom of unbalanced growth, just as a big deficit is.
持久且稳固的经常账户盈余和数额庞大的赤字一样,都预示着一国失衡的增长.
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