S.g.iron
[机] 球状石墨铸铁
🗣️ 情景例句
See you later.
待会见。
He studied quite a lot.
他非常用功。
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。