Ntau lub hnab kawm ntawv raug kaw los ntawm zipper, thaum lub zipper puas lawm, tag nrho lub hnab tau muab pov tseg.Yog li ntawd, lub hnab kev cai zipper xaiv kuj yog ib qho ntawm cov ntsiab lus tseem ceeb.Zipper yog tsim los ntawm cov saw hniav, rub lub taub hau, nce thiab nqis nres (pem hauv ntej thiab nraub qaum) los yog xauv qhov chaw, ntawm cov saw te ...
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