(of hatchlings) covered with down and having eyes open; capable of leaving the nest within a few days
例句与用法
1.
The incubation period lasts 18 - 21 days . the young are precocial , and after being hatched they leave the nest with their parents within 12 hours 双亲轮流孵化，孵化期为18 ~ 21d 。雏鸟为早成鸟，出壳后12h内即随亲鸟离巢。
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