留美老师带你每日说英文 第430期:叶绿素的分解

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台湾籍旅美老师今天交给我们的句子是：

Chlorophyll breaks down and is replenished all summer long. As daylight hours shorten, however, veins that bring water and nutrients to the leaf gradually close off.
整个夏天，叶绿素不断分解，然后又被补足。但是当日照时数缩短的时候，为叶子带来水分跟营养的叶脉会逐渐关闭。