名词
中文翻译：直根
同义词：
['main root', 'primary root']
例句：
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1.The tree has a single main root thatgrows straight down from the trunk.
这棵树有一个单一的主要根，从树干直接向下生长。
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2. The roots of the plant aredeep and spread out to support the entirestructure.
植物的根深且向外伸展以支撑整个结构。
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3. The scientist studied theroots of the plant to determine how itabsorbs water and nutrients.
科学家研究了植物的根来了解它如何吸收水分和养分。