It specifically discusses the process of sorting materials to help learners to collect materials.
为避免学习者对收集的资料简单罗列，本文详细论述了整理资料的过程。
The cost of collecting, transporting and sorting materials generally exceeds the revenues generated by selling the recyclables, and is also greater than the disposal costs.
垃圾废料收集、运输与分类的费用通常超过了售卖回收处理品所得到的财政收入，而且这些费用还远远高于直接处理这些垃圾的费用。
The city set up a central recycling center for sorting recyclable materials, food-based and waste.
这个城市建立了一个中央回收中心，对可回收材料、食品和废料进行分类。
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