一旦发生火灾，记住要清洁地面附近的空气。
In the event of a fire, remember the cleanest air is closest to the ground.
本文采用时域有限差分法，分析电磁脉冲作用下，地面附近同轴电缆所感应的外皮电流。
The EMP cortically induced current in coaxial cables near the ground is analysed by using Finite-Difference Time-Domain method in this paper.
依据它的测量数据，科学家们可以估定在地面附近和其它海拔高度有多少臭氧存在——特别是平流层。
OMI allows scientists to assess how much ozone is present at various altitudes—particularly the stratosphere—and near the ground.
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