Qhov no yog ib qho ntawm cov dev uas tau kawm tshaj plaws thiab nws pom nws tus kheej zoo heev hauv kev cob qhia. Nws qib kev txawj ntse yog siab heev thiab nws tsis tawm ntawm 20 tus dev tshaj plaws tshaj plaws. Nws yooj yim ua tiav cov hauj lwm uas ua rau lwm tus dev. Yog tias koj tsis muaj kev cob qhia kev paub, ces qhov no yog ib qho zoo tshaj plaws dev.
in dev