名词
中文翻译：落叶
同义词：
['leaf fall', 'leaf stripping']
例句：
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1. The forest was heavily defoliated by the heavy rain.
大雨导致森林严重落叶。
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2. The scientist observed the process of leaf stripping in the field.
科学家在田间观察了叶剥的过程。
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3.The tree's leaves are falling off due to the lack of sunlight.
由于缺乏阳光，树木的叶子正在脱落。