the most recently laid, are barely a day old. 是最近产下的 还不到一天大
The only option, a good old scratch. 唯一的办法就是用爪子挠
This youngster is only a few months old. 这只幼崽只有几个月大
At three months old, the youngster is starting to explore. 小狐猴三个月大时便开始探索世界
This female has the added pressure, of having to provide for her one year old cub. 这只雌豹因为要抚养她的一岁大的孩子 而担负着更大的压力
The ducklings are only twenty four hours old. 小鸳鸯才24个小时大
They were alive before the pyramids were built and were already three thousand years old when Christ was born. 它们在金字塔建造之前就发芽了, 耶稣诞生的时候它们已经活了3000年
The whale calf is now five months old. 小座头鲸现在有五个月大了
The calf is no more than a few weeks old. 幼鲸才刚刚几周大