生长激素帮助儿童长高。
Growth ___hormone helps children grow taller.
生长激素帮助儿童骨骼和肌肉发育。
Growth ___hormones help children develop their bones and muscles.
运动时释放的内啡肽常被称为快乐激素，因为它能改善心情。
Endorphins released during exercise are often called the happy ___hormone because they improve mood.
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