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。
2
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%。
3
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.