Wp/mww/Daim tawv nqaij
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Daim tawv nqaij yog txheej ntawm feem ntau mos, hloov tau cov ntaub so ntswg npog lub cev ntawm ib tug vertebrate; Lwm yam tsiaj npog; Txhua tus tsiaj muaj qee cov plaub hau ntawm lawv daim tawv nqaij yog lub cev loj tshaj plaws. Nws npog tag nrho lub cev. Nws ua haujlwm tiv thaiv tshav kub, lub teeb, raug mob, thiab kis kab mob.