Cov hniav ntawm ib qho kev xyaum dej khov yog qhov tseem ceeb ntawm nws "cov khau," thiab siv sijhawm ntev yuav hnav lawv, txo lawv txoj sia. Yog tias cov laum dej khov ua npub, siv lawv los glide yuav nyuaj heev. Yog li ntawd, kev hloov cov hniav yog qhov tseem ceeb los tswj cov dej khov qhov kev ua tau zoo.
Yog li ntawd, thaum twg koj yuav tsum tau hloov cov ice laum hniav? Feem ntau, yog tias koj nquag koom nrog cov dej khov lossis daus, nws raug nquahu kom hloov cov hniav ib zaug lossis ob zaug hauv ib lub lis piam. Tau kawg, hloov lawv ntau dhau yog qhov tsis tsim nyog thiab yuav ua rau cov nqi nce ntxiv. Ua ntej koom rau hauv ib qho kev ua si sab nraum zoov, nws tseem ceeb heev los xyuas qhov xwm txheej ntawm cov dej khov pob zeb. Yog tias lawv hnav ntau dhau los yog deformed, lawv yuav tsum tau hloov tam sim ntawd kom muaj kev nyab xeeb.
