Polychlorocarbon
[化] 多氯烃; 多氯代烃
🗣️ 情景例句
OK.
好。
Innocent fool
无罪的傻瓜
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。