Hais Txog Duab Cim

Los ntawm cov ntaub ntawv kom paub qhov txawv, cov ntaub ntawv ntau lawm ntawm cov nplooj ntoos zeeg feem ntau yog cov ntawv, tab sis kuj yas, hlau, thiab lwm yam. Tsis tas li ntawd, cov hom tshiab ntawm cov ntawv ntaws tau muab ua ntawm holographic kev ruaj ntseg cov ntaub ntawv kuj tshwm sim. Los ntawm qhov pom ntawm nws cov duab, nws yog ntau ntau haiv neeg: ntev, ob npaug, round, triangular, hnab tshos-hauv-hnab, thiab lwm yam tshwj xeeb duab yog tiag tiag muaj tsos zoo.

Tus qauv tsim, luam ntawv, thiab siv cov khaub ncaws hnav yuav tsum yog qhov tshwj xeeb, tshwj xeeb tshaj yog cov qauv tsim, nws yuav tsum raug kho raws li lub npe me me, ua tib zoo xav txog cov ntsiab lus nram qab no: t yuav dhau yooj yooj yim.