40 是视野角度（FOV），就像你睁大眼睛还是眯着眼睛看。
FT Videos & Podcasts
，详情可参考51吃瓜
Maybe we can pass in an estimated length?
My partner made the Reviung41 keyboard for me as a gift. The bottom and top plates are walnut. It’s beautiful. It doesn’t have LEDs. The keycaps are blank black DSA profile. It has Cherry MX Clear keyswitches, which are nice and tactile, but quiet—ideal for my travel keyboard.