Haeckel's gastrea theory
[医] 黑克耳氏原肠祖学说
🧩 词语组成解析
n. 原肠动物
🗣️ 情景例句
We're strangers here; can you help us find ...?
我们在这里人生地不熟，您能告诉我们__在哪里吗？
May I ask you a question?
我可以问一个问题吗？
You are walking too fast. I can't keep up with you.
你走得太快，我跟不上。