Mesectoblast
中外胚层, 外中胚层
🗣️ 情景例句
Yes. Here's the survey report issued by the Health Office, which is absolutely reliable.
有。这是由卫生检疫所签发的检验报告，它是绝对可靠的。
He's not in. May I take a message for him?
他不在，我能替他捎个口信吗？
What's it?
是什么？