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Nws yog ib qho yooj yim thiab kev lag luam yooj yim los nruab rau saum npoo ntawm ntau lub hauv paus. Qhov zoo ntawm lub hauv paus tsis siab. Nws tsis yog kev ntshai ntawm kev tawg, tsis muaj kev txhawj xeeb ntawm qhov ntsej thiab txiav txim siab. Cov khoom cua nyom khoom yog ib puag ncig, cov khoom tiav yog tsim, lub sijhawm tsim kho yog ruaj thiab luv, qhov zoo yog yooj yim rau tus tswv, thiab kev lees txais yog yooj yim.

Cov txheej txheem zuag qhia tag nrho ntawm cov nyom dag kis las ncaws pob yog qhov zoo nkauj, kev siv tus nqi yog siab, lub sijhawm muaj peev xwm ncav cuag ntau dua 8 xyoo, thiab nws yog qhov ruaj khov thiab txij nkawm-tiv taus, thiab tuaj yeem siv tsis tu ncua txhua hnub.

Cov nyom dag yog qhov yooj yim rau kev tswj, cov nqi saib xyuas qis, tsuas yog yuav tsum tau yaug nrog dej kom tshem tawm cov av, thiab muaj cov yam ntxwv ntawm tsis-fading thiab tsis deformation.

Khoom dag turf muaj cov yam ntxwv ntawm kev poob siab nqus, tsis muaj suab nrov, kev nyab xeeb thiab tsis muaj kev phom sij, elasticity, thiab nplaim taws rov zoo. Nws haum rau kev siv hauv tsev kawm ntawv thiab tam sim no yog qhov chaw zoo tshaj plaws rau kev qhia, kev ua si, thiab kev sib tw.

Khoom cua dag nyom siv lub tswvyim ntawm kev nyab xeeb thiab kev tiv thaiv ib puag ncig kom tsis txhob raug mob kis las. Nws muab cov cushioning lub zog txaus los txo qhov kev puas tsuaj uas yuav los ntawm qhov chaw dav dav rau hauv ko taw, kom koj dim ntawm ntau qhov kev txhawj xeeb los ntawm qhov chaw.