当增加氡换气扇时，可进一步降低氡的水平。
When radon ventilation fans are added radon levels can even be reduced further.
其它的照顾者们更进一步。他们说，当他们看见自己所爱的人的有形身份之门被关上，另一扇形而上学之门慢慢打开。
Other caregivers went further. They said that as they watched the door close on their loved one's physical identity, a door to the metaphysical slowly opened.
通过对矿用局扇的性能试验研究和实际运行性能对比分析，进一步明确了对局扇运行性能的要求。
Through comparison analysis on actual operation performance of local fan for mine, and the requirement of local fan performance is identified further.
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