用机会损失（后悔值）概念对随机存贮系统的各种临界比公式进行了统一处理。

Moreover, according to the concept of opportunity loss or regret, we give a universal formula of the crisis ratio for stochastic inventory model.

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如果税赋上升到70%、80%、90%的临界百分比，会不会有风险。

Isn't there the risk, if taxes reach 70, 80, 90 percent marginal rate.

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博尔德，科罗拉多，6月30日(合众国际社)- - -一项研究报告，北极气候系统受全球变暖影响可能比以前所认为的更大，也许正接近气候变化的临界点。

BOULDER, Colo., June 30 (UPI) — climate systems in the arctic may be more affected by global warming than previously thought and may be nearing a climate-change tipping point, a study says.

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