Biofiltration
生物过滤(作用)
🗣️ 情景例句
Your duties include checking the post and distributing it.
你的职责是检查和发送邮件。
The small courtesies sweeten life; the greater ennoble it.
有点礼貌使生活愉快，多点礼貌使生活高尚。
The majority of thepatients attending the medical out-patients departments of our hospitals
在医院门诊部看病的大多数人