Nitrococcus
亚硝化菌
🗣️ 情景例句
I'd like to make an appointment to discuss a question.
我想约个时间讨论个问题。
I will look down the hallway.
我往下看大门口吧。
They stretch out their legs like flying squirrels.
它们伸展四肢，就像飞行中的松鼠一样。