Biofiltration
生物过滤(作用)
🗣️ 情景例句
Could I bum some money off of you?
我能先从你那借点钱吗？
What is the total circulation of this journal.
这份报刊总发行量多少？
People said gold could easily be picked up by washing sand from the river in a pan of water.
据说，在一盆水里淘洗可沙就很容易找到金子。