Pb yeeb nkab yog ib qho polymer, nrog qhov tshwj xeeb ntawm cov nplais, Cov nram qab no Xiaobian yuav tuaj qhia koj txog cov yam ntxwv ntawm nws daim ntawv thov kev paub:
Ua ntej tshaj, pb lub raj muaj cua kub, ua kom muaj zog, tshuaj tsw qab, tsis muaj ntxhiab, tsis muaj ntxhiab, tsis muaj ntxhiab, muaj qhov kub, kub, kub, siab, Tsis muaj txhaws, -piav tus yam ntxwv, yog li tam sim no lub qhov ntawm kev siv pb raj yog qhov dav heev. Tom qab ntawd, cov yeeb nkab yog lub ntiaj teb feem ntau cov khoom siv tshuaj, Kuv ntseeg hais tias yav tom ntej ntau thiab ntau yam kev tsim kho vaj tse, kho kom zoo nkauj sab hauv, tag nrho cov kev lag luam kho kom zoo nkauj.
Qhov no yog cov yam ntxwv ntawm kev siv pb cov ntaub ntawv sau txog kev cia siab tias feem coob ntawm cov neeg siv yav tom ntej siv cov txheej txheem yuav pab tau.
