leaf fall 落叶 ; 叶落
Maple Leaf fall 枫叶落下
early leaf fall 早期落叶
Leaf Fall Period 落叶期
secondary leaf fall 第二次落叶
Corynespora Leaf Fall Disease 霉落叶病
leaf fall of apple tree 苹果叶片脱落
Fall of leaf 秋日落叶
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。
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。
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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