Sorry, I just like to watch almost all kinds of ball games. I'm strictly spectator.
对不起,我仅仅喜欢观看几乎所有的球类比赛,我是个十足的观众。
This is because they had no natural enemies until the arrival of humans and therefore did not need to develop flying wings.
这是因为人类到达这里之前,这些鸟没有天敌,因此,它们不需要发育飞行的翅膀。