Tom qab cov saw hlau tiav lawm

Hloov mus rau lub taub hau, txoj saw tseem xoob, yog hais tias lub saw ntev dhau lawm, koj tuaj yeem txiav ib ntu, yog tias cov saw hnyav hnyav, uas yog, qhov taub sprocket txoj hauj lwm muaj qhov hniav, cov saw hlau ua kom loj dua, nws yog tsim nyog Xav txog Kev hloov qhov saw txauv,