Circumerosion
环蚀; 环形剥蚀
🗣️ 情景例句
Marilyn Stewart, this is Harry Bennett.
Marilyn Stewart，这是Harry Bennett。
What are you looking for?
你正在找什么？
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。