... sea level altitude correction factor 海拔校正系数 altitude level 测高程水准仪 ; low altitude low level 低空 ...
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low altitude low level
低空低空
以上为机器翻译结果，长、整句建议使用 人工翻译 。
But high-altitude carbon emissions are reckoned to be more damaging than low-level ones, although nobody is sure by exactly how much.
ECONOMIST: Flying and climate change
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