发布于:2025-07-06 06:06浏览量:186文/优校网
1.【生化】培养基;基质;【农】下层土;底土,心土;【摄】(胶片片基与乳剂间的)胶层
2.下层;基础;【生】(生态学中的)基层;根本
3.〈美〉下层社会
1.a layer of something that is below another layer, especially in the ground
2.a basic feature or aspect of something that exists but is not easy to see