Nitrosogloea
亚硝化胶团菌属
🗣️ 情景例句
When did the Roman Empire come into being?
罗马帝国是什么时候形成的？
I ought to write a letter.
我应该写一封信。
So the number of stars that we know exist is now estimated at about 300 million million million.
因此，我们所知道的现有恒星数目估计约有30亿×1000亿颗。