Mesoderm
n. 中胚层\\n[医] 中胚层
🗣️ 情景例句
I have an idea that may solve the problem for him
我有个主意他也许能解决这个问题
Joe felt the lecture wasn't very interesting.
乔感觉演讲一点也不精彩。
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。