filtration

n [U] process of filtering liquid, etc 过滤.

fillet, filling, filling station, fillip, filly, film, film show, film star, film test, film-strip, filmy, filter, filter-paper, filter-tip, filter-tipped, filth, filthily, filthiness, filthy, filtrate, fin, finable, final, finale, finalist, finality, finalization, finalisation, finalize, finalize, finalise, finally, finance, finance company (also finance house), financial, financial year (US fiscal year), financially, financier, financing, finch, find, find a way,