名词
中文翻译：主要根
同义词：
['main root', 'main stem', 'primary stem']
例句：
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1. The tree's primary root is visible at the base of the trunk.
这棵树的主根在树干底部可见。
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2. The primary root of a plant is where it grows from the soil.
植物的根部是它从土壤中生长出来的。
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3. The primary root of the tree was damaged by the heavy rain.
这棵树的主要根因大雨受损。