Objective to deepen the depth and widen the range of the surveillance on the distribution of high arsenic and high fluoride in Wusu City thus to provide scientific basis for prevention.
目的进一步明确乌苏市高砷、高氟区分布范围，为防治工作提供科学依据。
GA also appears to be reliable in the prevention of AH, provided good anesthetic depth is achieved.
如果麻醉深度合适，全麻也是一种预防AH的可靠方法。
The fact that 70 percent of gypsum mines in our country are underground demands in-depth research on underground mining techniques and damage prevention methods of gypsum mines.
我国石膏矿70%是地下开采，石膏矿地下开采技术及灾害防治措施需要深入研究。
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