留美老師帶你每日說英文 第430期:葉綠素的分解

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臺灣籍旅美老師今天交給我們的句子是：

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.
整個夏天，葉綠素不斷分解，然後又被補足。但是當日照時數縮短的時候，爲葉子帶來水分跟營養的葉脈會逐漸關閉。