在合适的环境中、合适的计量，它们能引起问题而不是阻止氧化。

In the right context and the right dose, they may be able to cause problems rather than prevent them.

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然而，研究人员发现在30摄氏度这种清除过程并不能清除活性氧或阻止氧化损伤的发生。

However, at 30 degrees centigrade the researchers found that the cleanup processes cannot cope with ROS and oxidative damage occurs.

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大气中的二氧化碳和甲烷阻止热量向太空散发。

Carbon dioxide and methane in the atmosphere block the escape of heat into space.

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