But recent discoveries suggest that strokes and heart attacks may have been bedeviling humans for millenia.
但最新研究发现，中风和心脏病很可能已经困扰了人类几千年。
Previous changes in carbon dioxide levels were due to natural factors, such as rock weathering, and occurred very sluggishly, over many millenia.
以前二氧化碳的含量水平变化是因为自然因素，像持续数千年缓慢进行的岩石风化。
Previous changes in carbon dioxide levels were due to natural factors, such as rock weathering, and occurred very sluggishly, over many millenia.
以前二氧化碳的含量水平变化是因为自然因素，像持续数千年缓慢进行的岩石风化。
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