Facit
[医]断续三股螺旋的原纤维缔合胶原蛋
🗣️ 情景例句
Could be.
也许。
I have no secret of success but hard work.
成功无秘诀，只是努力干。
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。