肾脏分泌激素维持体内平衡。

Shènzàng fēnmì jīsù wéichí tǐnèi pínghéng.

The kidneys secrete hormones to maintain internal balance.

汗腺分泌汗液来调节体温。

Hànxiàn fēnmì hànyè lái tiáojié tǐwēn.

Sweat glands secrete sweat to regulate body temperature.

运动可以促进身体分泌让人快乐的激素。

Yùndòng kěyǐ cùjìn shēntǐ fēnmì ràng rén kuàilè de jīsù.

Exercise can promote the body to secrete hormones that make people feel happy.