The work in the city is only 30 percent done, and 70 percent is still under the sand.

这个城市对旅游的工作仅做了30%，剩下70%的旅游资源仍然被埋在沙子里没有开发出来。

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Answer: want first choice, remaking sand, through the magnetic separation, flotation or chemical purification, silica be 95 percent.

答：先要精选，再制砂后，经磁选、浮选或化学提纯后，二氧化硅能达到95%。

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Applying the stimulation with fracturing for sand shale in Daqing volcanic gas reservoir, the success rate of operation is only 36 percent. The result of the stimulation is bad.

火山岩气藏应用砂泥岩压裂技术进行增产改造，施工成功率只有36%，增产效果差。

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In Africa demand for water has shrunk Lake Chad by 95 percent since the 1960s, leaving only sand and scrub.

CNN: Desertification: How to stop the shifting sands