Casia
化学文摘题目索引通报
🗣️ 情景例句
Can you arrange an interview for tomorrow?
你可以安排在明天面谈吗？
What is the weather like in this country?
这个国家的气候如何？
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。