Biofiltration
生物过滤(作用)
🗣️ 情景例句
How many days will it take for my mail to reach its destination?
我的信件到达目的地要用几天？
Hello. Is Marie Ward there, please?
喂，请问玛丽沃德在吗？
I must go to the butcher's, too.
我还要到肉店去一下。