名词
中文翻译：落叶脱落
同义词：
['leaf fall', 'leaf drop']
例句：
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1. The tree's leavesare starting to abscise from thebranches.
这棵树的叶子开始从树枝上脱落。
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2. During autumn, many trees experienceleaf abscission as they shedtheir old leaves.
在秋天，许多树木经历着叶落，因为它们会脱掉旧叶子。
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3. The process of leaf abscission is a natural part ofthe plant life cycle.
叶落过程是植物生命周期的自然部分。