Nonsingular
非退化的, 非奇的
🗣️ 情景例句
I can't eat another bite.
我一口也吃不下去了！
Don't get on my nerves!
不要搅得我心烦。
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。