hormone
n. 激素，荷尔蒙；人造激素；性激素（hormones）
复数 hormones
例句
Oestrogen is a female sex hormone.
雌激素是一种雌性荷尔蒙。
《牛津词典》
When the stem dies, its hormone signal also ceases.
当茎死亡时，它的激素信号也停止了。
Ethylene is the natural plant hormone in fruit that makes them turn ripe, apparently.
很明显，乙烯是水果中天然的植物激素，使水果成熟。
