The concentration of nitrogen trifluoride in the atmosphere is about 0.5 part per trillion, making it very hard to measure.
大气中三氟化氮的浓度大约为0.5万亿分之一(ppt)，使得它很难测定。
The concentration of nitrogen trifluoride in the atmosphere is about 0.5 part per trillion, making it very hard to measure.
大气中三氟化氮的浓度大约为0.5万亿分之一(ppt)，使得它很难测定。
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