The explanation begins with the apical bud. This bud is at the end of the actively growing tip of the plant.
解释要从顶芽开始。顶芽位于植株活跃的生长点末端。
These hormones exist naturally in the plant, usually the highest concentration of which is at the growing tip.
这些激素自然存在于植物中，通常最集中在快速生长的部位。
This bud is at the end of the actively growing tip of the plant.
顶芽位于植株活跃的生长点末端。
Researchers have known since the nineteen thirties that the actively growing tip of a plant releases a hormone called auxin.
自1930S起，研究人员就了解到生长旺盛的植物顶梢会释放出一种被称为茁长素的激素。
Researchers have known since the nineteen thirties that the actively growing tip of a plant releases a hormone called auxin.
自1930S起，研究人员就了解到生长旺盛的植物顶梢会释放出一种被称为茁长素的激素。
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