Development can refer to maturity in terms of physical, cognitive, language, social-emotional, temperament, or fine and gross motor skills development.

发育可以指身体、认知、语言、社会情感、气质，或精细和大运动技能的发育。

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When the rats' offspring reached maturity (at 60 days), the researchers examined their emotional behavior - anxiety and depression - and social behavior.

当大鼠的后代进入成年期(出生60天)后，研究者们检查了它们的社会行为和情感行为如焦虑、抑郁。

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Our biological maturity, our social maturity and our sense of our own emotional maturity all happen out of synch - they certainly don't all happily click into place on our 18th birthday.

BBC: NEWS | Special Reports | Path to adulthood in the divided world