环保人士和地方政府越来越关注于旧电子设备带来的有毒危害以及安全回收这些产品的成本。
Environmentalists and local governments are increasingly concerned about the toxic hazard posed by old electronic devices and the cost of safely recycling those products.
如何控制边坡的变形与稳定构成了挂帮矿安全回收的关键技术问题。
How to control the slope deformation and stability became the key technical issue in the safe recovery of the hang-up wall ore.
如何安全回收采区上下山孤岛煤柱，提高矿井资源采出量，是矿井生产中遇到的难题之一。
It is one of challenges in the mining production to recover these coal pillars in order to increase the yield.
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