An arched roof, window or doorway is curved at the top.
From the television room an arched doorway leads into the hall.
一个拱形门廊从电视房通向大厅。
An arched bridge has arches as part of its structure.
She led them up some stairs and across a little arched stone bridge.
她带他们上了些台阶,然后走过了一座小石拱桥。