名词
中文翻译：主干
同义词：
['main trunk', 'main branch']
例句：
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1. The main canopy of the forest provides shade for the trees.
森林的主干为树木提供了阴凉。
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2. The main canopy of the mountain is covered with snow.
山的主干被雪覆盖。
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3. The main canopy of the tree is a large leaf that provides shade.
树的主干是一片大叶子，提供阴凉。