北极比南极温暖，其周围的空气循环更为畅通。
The north pole is warmer than the south and the circulation of air around it is less well contained.
南极是地球上最适合进行这些观察工作的地方。首先，这里位于高原地区，大约有2英里的海拔高度；其次，空气中的水分很少，不至于对辐射造成扭曲。
The South Pole is the best place on the planet for these observations, as it's on a plateau that's almost 2 miles high, and the high, cold air contains very little radiation-distorting water vapor.
南极的洁净空气扇区(这个区域基本上没有任何空中，地面交通工具，甚至连行人都没有)被认为是地球上空气最干净的地方。
The air sampled from the South Pole's clean air sector (a zone where air traffic, land vehicles, and even foot traffic is strictly limited) is touted as the cleanest air on Earth.
应用推荐