Bouginage
[医] 探条扩张术
🗣️ 情景例句
Six words.
有六个字。
Courtesy costs nothing.
谦虚恭敬，不用分文。
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。