名词
中文翻译：主干
同义词：
['main stem', 'main branch', 'principal part']
例句：
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1. The tree has a main stem that supports the rest of its branches.
这棵树有一根主要的树干，支撑着其他树枝。
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2. The main branch of the forest is home to many different species of animals.
森林的主要分支是许多不同物种动物的家园。
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3. The main branch of the company's strategy focuses on expanding into new markets.
公司战略的主要分支专注于拓展新的市场。