We should encourage reclamation and recycling.我们应当鼓励废物的回收和利用.The reclamation nozzle captures a portion of the spent driver gas.回收喷管收集一部分用过的驱动气体.Often those species that can be most easily bred are the most useless in rec...
为保持土壤肥力,农民搞作物轮作.Farmers rotate their crops so that the soil will remain fertile.农作物轮作有助于防止水土流失.Crop rotation helps prevent soil erosion.他连续5年在同一块地里种植不同的作物，研究人员称之为轮作。He grew a different crop on the same field five years i...