名词
中文翻译：外层韧皮部
同义词：
['outer phloem', 'outer cortex']
例句：
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1.The plant's growth is closely linked to the external phloem.
植物的生长与外层韧皮部密切相关。
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2.The study of the external phloem has important implications for forestry.
对外层韧皮部的研究对林业具有重要意义。
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3.The researchers found that the external phloem plays a crucial role in plant growth.
研究人员发现，外层韧皮部在植物生长中起着关键作用。