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
The important thing is that you tried.
重要的是你已经努力过了。
Do you have any more colors?
有别的颜色吗？
Rubbish, however, is only part of the problem of polluting our planet.
然而，垃圾只是我们这个星球的污染问题的一个方面。