Endotoscope
[医] 耳[内]镜
🗣️ 情景例句
No.
不痛。
What makes life dreary is the want of motive.
没有目的，人生就黯淡无光。
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。