翻译:we know that the levels of carbon dioxide have increased greatly over the last 100 to 150 years.

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翻译:weknowthatthelevelsofcarbondioxidehaveincreasedgreatlyoverthelast100to150years.翻译:weknowthatthele

翻译:we know that the levels of carbon dioxide have increased greatly over the last 100 to 150 years.
翻译:we know that the levels of carbon dioxide have increased greatly over the last 100 to 150 years.

翻译:we know that the levels of carbon dioxide have increased greatly over the last 100 to 150 years.
众所周知,二氧化碳的含量在过去的100到150年里增长的很快.

我们知道二氧化碳的数量(单位)已经超过前100至150年。

建议翻译为:我们都知道,在过去100至150年间,二氧化碳的含量已经大幅增加了。
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