The bugaboos in larger versions of this optimistic vision are highly variable flows of material, and decentralized, dilute concentrations of reclaimable stuff.

这个乐观观点的描述最多的，高变异性的物质流动，及可回收物质密度的稀释。

The state shall timely formulate the requirements on the minimum rate of use of the reclaimable materials.

国家适时制定最低再生材料利用率要求。