21. Kev ceev faj txog kev ua neej nyob muaj pes tsawg leeg Nyob rau hauv qhov tseem ceeb ntawm cov muaj pes tsawg leeg, yuav tsum tau them nyiaj mloog mus rau kev npaj thiab muaj pes tsawg leeg ntawm cov ntsiab lus, kab, nto, duab, xim thiab qhov chaw;Qhov sib xyaw ua ke yuav tsum muaj qhov chaw nruab nrab, teeb tawm, nyuaj thiab yooj yim, sib sau ua ke thiab tawg, ceev, thiab p ...
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