In this research, the earthworms soil bed was regarded as an experiment equipment of sewage disposal.
本研究将蚯蚓——土壤床作为污水处理的一种试验装置。
The soil bed formation is a complex process which involves sedimentation and dead-weight consolidation.
悬浮泥沙到沉积土的形成过程非常复杂，涉及到泥沙的沉降和土的自重固结。
Bed planting improves soil fertility and structure and helps reduce erosion, water usage, herbicide use and facilitates mechanical and manual weeding.
垄播改善了土壤肥力和结构，对减少流失、水的利用和除草剂的施用也有帮助，也方便了机械和人工除草。
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