💡 服务保障： 5-7天送达。支持7天无理由退货（仅退书款，运费及寄回运费需自理，书本需无损）。

🇬🇧 Service Guarantee: 5-7 days delivery. 7-day unconditional returns accepted (refund for books only; shipping fees & return shipping costs are non-refundable, books must be undamaged).