🧩 词语组成解析
🗣️ 情景例句
They have an opening.
他们有一个空房间。
A contented mind is perpetual feast.
知足常乐。
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。