noun🔗Share竖框，窗棂。 A vertical bar between the panes of glass or casements of a window or the panels of a screen."The sunlight streamed through the window, highlighting the dust on the mullions that divided the glass panes. "阳光洒进窗户，照亮了分隔玻璃窗格的竖框上的灰尘。architecturebuildingpartChat with AIVocabulary GamePractice Reading
