🗣️ 情景例句
Can what?
能做什么？
On many farms you'll find cows and chickens.
在许多农场上你将发现奶牛和鸡。
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。