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。
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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