Nitrococcus
亚硝化菌
🗣️ 情景例句
Keep your nose to the grindstone; you'll succeed.
埋头苦干，总有成功的一天。
Henry got a toothache and asked to be excused.
亨利牙疼，请求离开一下。
Do you have any suggestions.
你说怎么办？