The yellow colour seen in some autumn trees results from the loss of chlorophyll simply unmasking the yellow carotinoids that were there all along.

部分树木的叶子在秋天里变成黄色，这是因为叶绿素的分解让黄色的类胡萝卜素暴露出来。

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On the other hand, "for former smokers, there is some evidence that vegetables high in carotinoids, such as carrots and sweet peas, decrease the risk, " he said.

另外，对以前有过吸烟历史的人来说，有证据表明富含红萝卜素的蔬菜如红萝卜和田豌豆，会有助于减少患病的危险。

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On the other hand, "for former smokers, there is some evidence that vegetables high in carotinoids, such as carrots and sweet peas, decrease the risk, " he said.

另外，对以前有过吸烟历史的人来说，有证据表明富含红萝卜素的蔬菜如红萝卜和田豌豆，会有助于减少患病的危险。

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