以下为句子列表：
英文: The most important problems research had to solve were: (1). build-up and maintenance of soil fertility; (2). avoid soil hardpan and (3). control soil erosion.
中文: 研究要解决的最重要问题是：（1）积累和维持土壤肥力；（2）避免土壤硬磐；（3）控制土壤侵蚀。
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英文: Statement of construction technique for hardpan steady used water
中文: 浅谈水稳砂砾层的施工工艺
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