This is yet another class that supports sorted collection of objects where each sort key must be unique.
这是另外一个可以支持排序的对象集合的类，其中每个排序键必须是唯一的。
The sorted collection and secured disposal for harmful waste should be emphasized in the urban settlement of peri-urban area.
城市型住区应注重有害垃圾的分类收集与安全处置；
In order to solve these imminent issues and turn municipal domestic waste into resources, the foremost step is the sorted collection of waste.
欲解决当下的难题，要将城市生活垃圾资源化，前置性的步骤是要把垃圾分类收集。
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