名词
中文翻译：树
同义词：
['trunk', 'main', 'main stem']
例句：
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1. The arbor of the tree is tall and straight.
这棵树的树干又高又直。
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2. The arbor was used to support the weight of the building.
这根主干支撑着大楼的重量。
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3. The arbor was decorated with colorful flowers.
这根主干上装饰着五颜六色的花朵。