砂石粒径
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sand and gravel size
砂石粒度
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The river deposit, which is made up of naturally graded sand and gravel, is characterized by its well gradation, easy control of its particle size, easy compaction and good permeability.
这种天然级配砂砾具有级配良好、粒径易控制、易碾压成型、透水性好等特点。
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