以下为句子列表：
英文: Because of the diminishing opportunity to expand cultivated land, researches have been mostly focused on the rise of yield per unit area.
中文: 由于扩大耕地面积的可能性越来越小，研究已主要集中于提高单位面积产量。
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英文: Commitment to the western three softinstability thick coal bed mining technology research, explore and master the three softcore instability thick coal bed mining technology, guns taken, the yield per unit at the National Research adopt the three softthic
中文: 致力于豫西“三软”不稳定厚煤层开采技术研究，探索和掌握了“三软”不稳定厚煤层开采的核心技术，炮采、综采单产处于全国“三软”不稳定厚煤层开采领先水平。
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