名词短语
中文翻译：茎的下部
同义词：
['lower part of the stem', 'base of the stem']
例句：
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1. Thelower portion of the stem is where the roots grow.
茎的下部是根生长的地方。
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2.The lower portion of the stem contains the main veins.
茎的下部包含主要的脉管。
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3. The lower portion of the stem is often used for planting vegetables.
茎的下部通常用于种植蔬菜。