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。
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%。
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。
By the end of the experiment, 10 percent of the sand had turned to dust, and it became redder and redder with the addition of magnetite.
实验的最后，有百分之十的砂子转变为粉尘，并且随着磁铁矿的加入，它变得越来越红。
By the end of the experiment, 10 percent of the sand had turned to dust, and it became redder and redder with the addition of magnetite.
实验的最后，有百分之十的砂子转变为粉尘，并且随着磁铁矿的加入，它变得越来越红。
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