而生长旺盛的草又都不是北美草原的物种，而是帕克德以前从没见过的。
The grasses that did thrive were not prairie species; Packard had never seen them before.
年平均降水量1200毫米，43%的降水量集中于作物生长旺盛的夏季。
The annual average precipitation 1200 mm, 43% of the precipitation concentrated in the strong summer crop.
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.
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