名词
中文翻译：原生木质部主干
同义词：
['primary xylem', 'primary vascular cambium']
例句：
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1.The protoxylem pole is the main part of the plant that supports its growth.
原生木质部主干是植物支持其生长的主要部分。
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2. The protoxylem pole is responsible for transporting water and nutrients throughout the plant.
原生木质部主干负责将水分和养分在整个植物中输送。
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3. During the early stages of a plant's life, the protoxylem pole is crucial for its survival.
在植物早期阶段，原生木质部主干对其生存至关重要。