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。
This also increases contrast and grain structure.
这种方法也能提高反差和突出颗粒。
Our blue sensitive, half speed film offers fine grain and high contrast.
我们的感蓝半速胶片提供了优良的晶粒和高对比度。
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