羽翼丰满，汉语成语，拼音是yǔ yì fēng mǎn，意思是小鸟的翅膀已经长齐，比喻力量已经巩固。出自《史记·留侯世家》。
他们并非新组织，大部分早已羽翼丰满、根深蒂固。
看我童年喂养的那只白鸽，而今，羽翼丰满，国外友人，飞寄来橄榄枝。
The white dove I fed when I was a child now becomes full-fledged and brings olive branches from foreign friends.
但是它们不会一直寄生在它们的宿主身上(虱子才会)，当鸟儿羽翼丰满时，鸡蚤就会离开。
But they do not (as, for example, lice do) live on their hosts continually. Once a bird fledges, therefore, it leaves its parasites behind.
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