The explanation for the pain is partly historic.
对这个麻烦的解释，人们认为部分由历史造成。
The increase in carbon dioxide has come partly from burning fossil fuels, and has surpassed historic highs in the past decades according to NASA.
二氧化碳的增加部分来源于化石燃料燃烧。据NASA称，过去十年间二氧化碳浓度达到历史最高。
The increase in carbon dioxide has come partly from burning fossil fuels, and has surpassed historic highs in the past decades according to NASA.
二氧化碳的增加部分来源于化石燃料燃烧。据NASA称，过去十年间二氧化碳浓度达到历史最高。
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