首先应用小挠度弹性理论，在一些合理简化假设的基础上，推导自平衡索桁架的初始刚度、松弛刚度及临界松弛荷载公式。

Based on the small-deflection elastic theory and some simplified assumptions, the initial stiffness, the slack stiffness and the critical slack load have been derived theoretically.

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索与求的平衡才能感到快乐。

Happiness is the balance between giving and receiving.

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经济衰退是导火索，而不是引发当前混乱的源头，惠誉国际在解释降级一事时说过，当前的混乱是源于加州长期无法平衡其预算。

The recession was the trigger but not the cause of the current malaise, which stems, as Fitch put it when explaining its downgrade, from “the state’s continued inability” to balance its budgets.

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