Biofiltration
生物过滤(作用)
🗣️ 情景例句
I've got extra time on my hands.
我有过多空闲时间。
I can manage. But thank you, anyway.
我自己行了，但还是要谢谢您。
With a smile the man from downstairs said: I'm sorry to trouble you, comrade.
“对不起，打扰你了，同志。”