Sprocket channel
[计] 定位道
🧩 词语组成解析
n. 链轮齿\\n[机] 链轮
🗣️ 情景例句
I don't know.
我不知道。
Rain before seven; fine before eleven.
雨过天晴。
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。