Spherolith
[医] 球状石(新生儿肾组织内)
🗣️ 情景例句
Please, sit down.
请坐。
It's easy to fall into a trap, but hard to get out again.
堕入陷阱易，脱离陷阱难。
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。