Ua ntej, rau cov txee hnyav yuav tsum ua txoj haujlwm zoo ntawm kev faib tawm, kom ntseeg tau tias tag nrho cov khoom raug muab tso rau hauv kev txiav txim, qhov thib ob, nws yog ib qho tsim nyog los xyuas kom meej tias txhua yam khoom muaj qee qhov kev ncua deb ntawm ib leeg, yog li ntawd yuav tsis muaj extrusion ntawm. cov khoom, kom cov khoom poob ...
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