A door or gate; an opening. Can also be used figuratively as an entrance or gateway.
古い家の木の扉が軋んでいる。
The wooden door of the old house is creaking.
彼は扉のところで立ち止まった。
He stopped at the door.
新しい技術は私たちの前に扉を開いた。
New technology has opened a door for us.
The title page of a book or magazine (the page carrying the title and often the author).
小説の扉には大きな書体で題名が書かれていた。
The novel's title was printed in large type on the title page.
雑誌の扉をめくると特集ページが始まった。
When I turned the title page of the magazine, the feature article began.