Chucking
夹具
🗣️ 情景例句
The mall's packed today.
今天商场里的人很多。
Shall we start the meeting now?
我们现在开始开会好吗？
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。