"折叠帆布躺椅" can be translated into English as "foldable canvas lounge chair" or "folding canvas deck chair".
"Foldable" or "folding" emphasizes the chair's ability to be folded for storage or transport.
"Canvas" refers to the material of the chair.
"Lounge chair" or "deck chair" describes the type of chair, typically used for relaxing or lounging.
Both translations are commonly used and convey the meaning accurately.