网络释义专业释义
... 万亿大卡 teracalorie 万亿分之几 parts per trillion; ppt 万亿分之一 part per trillion; ppt; trillonth ...
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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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And carbon 14, 6 again and it has 8, and it is found in vanishingly small amounts, 10 10 to the minus 12 or part per trillion.
碳14，6个质子，8个中子，它的存在是非常微小的，几乎趋于零，万亿分之。
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