Dab tsi yog cov ntsiab lus tshwj xeeb ntawm plaub -txoj kev buckle?

Snap khawm, tseem hu ua hood khawm, ib hom khawm. Qhov teeb meem tseem ceeb ntawm kev ua ib lub snap khawm yog pwm. Yog tias cov pwm rau cov nyees khawm sab saum toj thiab hauv qab yog qhov tseeb, koj tuaj yeem tsoo nws nrog rauj. Yam tsawg kawg koj xav tau ib tug pwm nrog ib tug concave ntug, txwv tsis pub nws yuav twv yuav raug hu tsis muaj txiaj ntsig. Nws yog lub tshuab nrog lub hauv paus ntsiab lus yooj yim heev, los ntawm rauj mus rau qhov tuag, mus rau ntau lawm thiab tshuab nias.