Ectomere
n. [生](分化为外胚层的)外裂球
🔁 扩展释义
【医】 成外胚层裂球
🗣️ 情景例句
What is it?
那是什么？
That's international practice. We can't break it.
这是国际惯例，我们不能违背。
but fearing that she would never see Rastus again -- the letter had made that quite clear -- she changed her mind.
但又害怕再也见不到拉斯特斯——这点，信上说得十分明白——于是便改变了主意。