You see a leaf fall and you think you know which way the wind blows.

你看到一片树叶落下你以为你就能知道风往哪吹？

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In plants, leaf fall and flowering are common responses to seasonal changes in day length.

在植物中，落叶和开花是对日长季节性改变的普遍反应。

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Buck scrapes are generally created after leaf-fall in autumn, which is just before or during the rut.

雄鹿窝通常出现在秋天落叶之后，也就是发情之前或发情期间。

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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

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

Both natural events bring the Japanese out en masse to celebrate the changing seasons, with hanami (cherry blossom viewing) parties in the springtime and momiji-gari (maple leaf viewing) in the fall.

BBC: K��y��: Japan��s autumn explosion of colour