Tus nab qhov muag tus nplaig lub cev tho yog ib hom nplaig tho qhov twg ob qhov sib cais ua rau ntawm tus nplaig, zoo li lub qhov muag ntawm tus nab. Hom kev tho no tseem hu ua "ob tus nplaig tho" lossis "forked nplaig tho." Nws yuav tsum tau muaj kev txawj ntse rab hmuv thiab tuaj yeem siv sijhawm ntev los kho dua li ib tus nplaig tho. Ib yam li kev tho lub cev, nws yog ib qho tseem ceeb uas yuav tsum tau saib xyuas kom zoo rau kev tho kom tsis txhob kis kab mob.
Koj yuav tsum muaj in thiaj li tso nyob rau hauv mus post ib comment.