Dab tsi ua rau cov ntawv xov xwm txhim khu kev qha[^ 1] dual torsion caij nplooj ntoos hlav[^2] rau nailing phom?
Dab tsi ua rau cov ntawv xov xwm txhim khu kev qha[^ 1] dual torsion caij nplooj ntoos hlav[^2] rau nailing phom? Koj puas tau muaj phau ntawv xov xwm latch ntawm lub cuab yeej ua tsis tiav? Nws ntxhov siab.