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.

youdao

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.

youdao