她见证了它从一个小小的、几乎没有毛的光溜溜的新生熊猫长成一个瘦长早熟的少年熊猫，而如今她要对一切说再见了。
She has watched him grow from a tiny, nearly hairless newborn into the lanky, precocious bear to whom she now must say goodbye.
你说，发育的早的孩子们比较成熟，称为早熟。
You talk about kids who develop early who are sort of mature as precocious.
Aleanie母亲说，她机敏早熟，发育速度惊人，四个月能坐，八个月会走。
She was alert and precocious and developed at astonishing speed, her mother said, sitting at four months and walking by eight months.
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