Since fresh black soil was cultivated, soil fertility has showed a decreasing trend.

黑土开垦种植后，土壤肥力呈下降趋势。

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The etching depth of the circles showed a decreasing trend in the same processing conditions.

比较了相同实验条件下直线轨迹与圆环轨迹的刻蚀深度。

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While the overall material input of iron ore and crude copper displayed a decreasing trend, that of crude aluminum presented ruleless over the study period.

全国铁矿石和粗铜的物质投入在整体上有较明显的下降趋势，但原铝的这一指标则无规律可循。

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In case of a higher debt ratio, the Treaty required it to show a decreasing trend.

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We expect this yield that reached nearly 9% in 2009 to follow a decreasing trend reaching 5% by the end of the Trefis forecast period.

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