Either of the two lines at 23°26′ north or south

• Farthest latitudes where the sun can be directly overhead

位于赤道以北或以南23°26′的两条回归线之一

• 太阳可直射至的最远纬度

Of or relating to the tropics; tropical

• Hot and humid

热带的；与热带有关的

• 炎热潮湿的

Inducing or directing a biological or chemical change in a system

• Especially of hormones acting on specific target tissues

能诱导或调控系统发生生物或化学变化的

• 尤指作用于特定靶组织的激素