Footmarks
n. 足迹
🗣️ 情景例句
I'm sorry, Marilyn.
对不起 ，Marilyn。
What can I do for you?
我能为您做些什么？
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。