沙沙和飞飞是一窝出生的两只燕子，他们刚刚长齐羽毛，妈妈时常提醒他们，要每天练习飞翔的技术和耐力。
Sasa and Feifei are two twin swallows. After they grew out feathers, their mother kept urging them to practise flying skills and train their stamina every day. Sasa was very assiduous.
美国洛杉矶县自然历史博物馆恐龙研究院负责人刘易斯·齐亚比说，这块皮肤上也没有长羽毛的恐龙所拥有的典型的羽囊。
And the skin also doesn't have the follicles that are typical of feathered dinosaurs, said Luis Chiappe, director of the dinosaur Institute at the Natural History Museum of Los Angeles County.
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