以下为句子列表：
英文: Abstract: Through a study on soil aggregate composition, nutrient status and enzymatic activity under mixed forest of Chinese fir Alniphyllum fortunei and pure stand of Chinese fir, the results indicated that, compared to pure stand, the soil structural p
中文: 文摘:通过对杉木拟赤杨混交林及杉木纯林土壤团聚体结构、土壤养分状况及酶活性的研究表明，与杉木纯林相比，混交林土壤结构性能得到改善，供肥和保肥能力加强，各种土壤酶活性提高，土壤肥力较好。
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英文: It is more and more important to determine the shear strength of rock-soil aggregate mixture quickly and accuratly while the mixture is widely used in roadbeds, dykes, dams and foundations.
中文: 摘要随著土石混合料越来越广泛地被道路、堤坝、基础等工程采用，快速、准确地确定其抗剪强度指标显得越来越重要，室内大型直剪试验具有操作简单，可快速测定混合料的强度指标等特点，因而在工程中被广泛应用。
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