Segmental cavity
[医] 囊胚腔, 分裂腔
🧩 词语组成解析
a. 部分的, 断节的\\n[医] 节的, 段的, 分节的
🗣️ 情景例句
What do you do?
你现在做什么工作？
How much is the postage for this?
这个邮费要多少钱？
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。