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1.The hypocotyl is the part of the seed that grows downwards and becomes the root.
胚轴是种子向下生长的部分，成为根。
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2. Hypocotyls are often used to describe the growth of plants in a greenhouse or other controlled environment.
胚轴通常用于描述植物在温室或其他受控环境中的生长。
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3. The hypocotyl of a tomato plant can be easily distinguished from its stem by its shorter length and more slender appearance.
番茄植物的胚轴可以通过其较短的长度和更细的外观与茎区分开来。