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Chaw tsim tshuaj kho mob pov tseg cov ntshav sau npauj npaim koob
Koob txhaj ntshav npauj npaim siv ua ke nrog cov raj nqus ntshav rau kev txhaj ntshav thiab kuaj ntshav hauv tsev kho mob lossis tsev kho mob. Cov txheej txheem txhaj ntshav raug kaw kom ntseeg tau tias lub raj koob txhaj tsis raug nthuav tawm, thiab cov ntshav raug kaw rau hauv qhov chaw nyab xeeb, tsis txhob sib cuag nrog ib puag ncig sab nraud, kom tsis txhob muaj kuab paug thib ob thaum tiv thaiv ib puag ncig.
