名词
中文翻译：主杆
同义词：
['main stem', "main axis例句：1. The tree's main pole is visible from the top of the hill.（从山顶上可以看到这棵树的主干。）"]
例句：
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1. The tree's main pole is visible from the top of the hill.
从山顶上可以看到这棵树的主干。
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2.The main pole of the building is made of steel.
这座建筑的主干是用钢制成的。
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3. The main pole of the car was damaged in the accident.
汽车的主干在事故中受损了。