Juvenile hormone suppresses their activity, and prevents the caterpillar from beginning metamorphosis too early.
保幼激素会抑制它们的活动，并防止毛毛虫过早开始变态。
Juvenile hormone
原声例句
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Then, when it’s nice and plump, the caterpillar’s levels of juvenile hormone drop, which triggers it to stop eating and moving.
然后， 当它又好又丰满时，毛毛虫的保幼激素水平就会下降，这会触发它停止进食和移动。
中文百科
保幼激素
保幼激素（英语：Juvenile hormones，简称为JHs）是一类对昆虫生理学的多个方面起调控的无环倍半萜类。JH类调控发育、生殖、滞育及非遗传多态性。
英语百科
Juvenile hormone 保幼激素
Juvenile hormones (JHs) are a group of acyclic sesquiterpenoids that regulate many aspects of insect physiology. JHs regulate development, reproduction, diapause, and polyphenisms.
In insects, JH (formerly called neotenin) refers to a group of hormones, which ensure growth of the larva, while preventing metamorphosis. Because of their rigid exoskeleton, insects grow in their development by successively shedding their exoskeleton (a process known as molting).
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