The prestressed anchor cable is to exert prestressed tension on unstable rock mass or structure to improve anti-slide capacity and structural stress of unstable rock mass.

预应力锚索是针对可能不稳定的岩体或建筑物基础施加预应张力，以提高不稳定体的抗滑能力和结构力。

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Spikes typically occur in conjunction with underlying structural shifts in the global economy, rendering model projections and trends unstable.

一般情况下，上升都是和全球经济各种根本结构性变化一起出现的，使各种模型预测和趋势变得不稳定。

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Regatta Director Iain Murray suggested reviewing and testing the structural integrity of the AC72 race boats, which sailors have called too unstable, and barring competition when winds are too strong.

WSJ: Lets Hope Robert Griffin III Doesn't Lose His Phone