以下为句子列表：
英文: Crumb structure The texture of a soil in terms of the size of the soil particles and how they interact, often determined simply by rubbing the soil with fingers.
中文: 团块状构造：根据土壤颗粒的大小及颗粒之间的相互作用而决定的土壤的质地结构。
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英文: Some soils, such as sandy soils, have a loose crumb structure with good drainage, whereas in clay soils the particles are small and stick together to give a dense crumb structure and poor drainage.
中文: 一些土壤例如砂土具有松散的结构，因而有良好的排水性，而在粘土中，由于土壤颗粒小而互相粘合导致粘土结构紧密排水性较差。
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