原文：Trees growing under streetlights sometimes keep their leaves longer because the artificial light disrupts their seasonal cues, which is why the tree outside my window is always the last one to drop.

譯文：路燈下的樹有時落葉會更晚，因為人造光照打亂了它們的季節(jié)性信號，難怪我窗外那棵樹總是最后一個掉葉子。