Qhov nruab nrab, cov tub ntxhais hluas siv lawv lub smartphone lossis ntsiav tshuaj rau ntau dua ob teev hauv ib hnub. Cov menyuam yaus feem ntau siv cov game consoles. Lub cev tshwj xeeb - lub taub hau tilted rau pem hauv ntej - ua rau mob caj dab, mob caj dab thiab thaum kawg kuj mob taub hau thiab nraub qaum. Qhov laj thawj: Hauv txoj kev sawv ntawm no, "lub ncauj tsev menyuam caj dab dai rau hauv nws cov leeg," ua haujlwm ntau dhau thiab ua rau nws dhau los ua rau kev khaus.