Nubian z20 adopts dual-screen design, which is novel in this respect. Although various brands have launched dual-screen designs before, such as YotaPhone, ZTE's secret and vivo's nex dual-screen, to be honest, Nubia is the one who has explored the role of dual-screen, and z20 has inherited the advantages of Nubian X's high concealment, and made some new upgrades, which is quite intentional. For example, the new pressure boundary operation can condense many common operations used in daily life and can be completed with a light grip. The key mapping function added to the back screen can also contribute to the game, and the four-finger operation is beautiful when eating chicken. The built-in JOS system can also realize the "screen world". When playing games, I like my colleagues who play games on the front screen and brush the strategy on the back screen. Multitasking is not a problem. Occasionally, if you are tired of watching the screen, you can turn on the back screen reading mode, which saves electricity and protects your eyes, killing two birds with one stone. For friends who like to pursue individuality, z20 can still consider starting.