Cave painting
出国 Abroad石洞壁画
🧩 词语组成解析
🗣️ 情景例句
What does John do?
John现在做什么事？
He is the top condition.
他的身体情况处在巅峰状态。
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。