他兴奋地写道，修葺一新的楼梯是用回收的牲口棚木头做的。 他们的家具也都是用回收来的木头钢铁做成；他们的咖啡桌实际上是二次回收利用，是做成地板的回收木材再一次被利用起来了。
Their furniture is also made from recycled wood and steel; in fact, the coffee table is wood that was reclaimed twice, having been salvaged from reclaimed wood that was being made into flooring.
这是一种贵金属二次资源的利用回收和提纯方法。
The method is to recycle and purify the secondary resources of noble metals.
通过分析我国矿产资源的特点，介绍了尾矿作为二次资源回收和利用的方法和途径。
The characteristics of the domestic resources are analyzed, and the method and ways of recovering and utilizing tailings are introduced.
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