Nitrobacterium
[医] 硝化菌
🗣️ 情景例句
The old couple has already been married for fifty years.
那对老夫妻结婚已经 50 年了。
I hadn't planned on swimming across the whole lake.
我可从没计划要游过整个湖。
that is something like 6,000,000 spiders of different kinds on a football pitch.
这就是说，在一个足球场上约有600万只不同种类的蜘蛛。