The weakened fall leaf then becomes vulnerable to the highly destructive effects of the oxygen created by the excited chlorophyll molecules.

活跃的叶绿素分子产生的氧气破坏性强，秋天衰弱的树叶随后变得更容易受到影响。

youdao

Do you ever wonder why a fall leaf changes color?

你们有没有想过为什么落叶会变色？

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The first was set in New England with beautiful fall leaf colors and a nice ocean coast.

第一个场景是在新英格兰，有漂亮的落叶颜色和美丽的海岸。

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For the first row nearest the fans, they generally suggested trees that lose their leaves in the fall or trees with waxy leaf surfaces.

VOA: special.2009.09.08

the fall of the yellowed,dry leaf.

VOA: special.2010.02.27

Premature leaf fall would thus be a bad thing.

ECONOMIST: The science of autumn

For inspiration, McCann staffers could scrounge up, for example, a link to a recent long-form video produced for Nissan last fall as a promotion for Leaf.

FORBES: Memo To McCann, Mahoney: Come Up With Better Volt Ads

Under an expanded New Electric Vehicle Limited Warranty, Nissan will protect against capacity loss in LEAF batteries that fall below nine bars, of the available 12 bars displayed on the vehicle's battery capacity gauge, for the first five years or 60, 000 miles in the United States, whichever comes first.

ENGADGET: Nissan upgrades US Leaf warranties, will 'restore' batteries that lose too much charge