In contrast, the recent surge in world grain prices is trend-driven, making it unlikely to reverse without a reversal in the trends themselves.

相比之下，最近的世界粮食价格上涨是由趋势造成的，除非趋势本身得以逆转，否则这种上涨是不可逆的。

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We also think that the late 2011 demand surge, although it will very likely reverse in Q1, is evidence that demand price elasticity exists in solar.

FORBES: Trina: Merrill Turns Bullish

What is more, recent productivity gains have been exaggerated not just by the cyclical impact of the boom, but also by an unsustainable surge in investment in information technology that has now gone into reverse.

ECONOMIST: American productivity