1 💰 商业科技 TechCrunch 2026-05-22 💬 Smart ring maker Oura files to go public 智能戒指市场领军者Oura提交IPO申请，用户已售550万枚，健康追踪赛道再掀波澜。 The Finnish company said in September that it has sold 5.5 million smart rings to date. 智能戒指 oura ipo 健康追踪 可穿戴设备