If a kangaroo laid an egg from which an ostrich hatched, that would surely be an ostrich egg, not a kangaroo egg.
If a kangaroo laid an egg from which an ostrich hatched, that would surely be an ostrich egg, not a kangaroo egg.
“如果袋鼠生的蛋孵出了鸵鸟，那应当说它是一只鸵鸟蛋，而非袋鼠蛋。”