n.大张折页插图，折叠插页

Gatefold Front Cover → 封面折页
Gatefold Back Cover → 封底折页
Gatefold Ads → 折页广告
BACK COVER GATEFOLD → 封底拉页；拉折封底
Gatefold of Front Cover → 封面拉页
Inside Full page Gatefold → 内页折页
Inside Gatefold → 内页拉页
front cover gatefold → 拉折封面
Gatefold of Front Page → 封面外拉页

【Noun】

1. an oversize page that is folded in to a book or magazine