flat基本解释
adj,平坦的；扁平的；浅的；单调的,同近
houses with flat roofs.平顶房
平的；单调的；不景气的；干脆的；平坦的；扁平的；浅的英释adjadjsmooth and level, without raised or hollow areas, and not sloping or curving
flat surface,平面；平整表面.短语
