单词	filter bed
释义	filter bed noun : a sand or gravel bed for filtering water or sewage Word History First Known Use 1828, in the meaning defined above
随便看	umland umlaut umlaut vowel umlauted umlauting umlauts Umm al Qaywayn umm al-qaiwain umm durmān ummahs ummas Umnak umohoite ump umped umph umphed umphing umphs umping umpirage umpirages umpire umpire assay umpire-in-chief

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