A cow produces only one calf a year whereas a female ostrich can lay an egg every other day.
A cow produces only one calf a year whereas a female ostrich can lay an egg every other day.
一头牛一年只生一头小牛，然而一只鸵鸟可以每隔一天下一个蛋。
A cow produces only one calf a year whereas a female ostrich can lay an egg every other day.
一头牛一年只生一头小牛，然而一只鸵鸟可以每隔一天下一个蛋。