中文说明：对于不规则散料围成的某部分面积进行区域近似计算，内附有详细计算说明
English Description：
The area of a certain part enclosed by irregular bulk materials is calculated approximately, with detailed calculation instructions
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中文说明：对于不规则散料围成的某部分面积进行区域近似计算，内附有详细计算说明
English Description：
The area of a certain part enclosed by irregular bulk materials is calculated approximately, with detailed calculation instructions