Thiab qhov zoo nkauj tiag tiag tus ntxhais no yog. Txog lub qhov - cov yeeb yaj kiab nthuav dav heev thaum lub qhov nyob hauv chav dej hauv lub tsev tom ntej thiab koj tsis tuaj yeem pom koj tus nrog sib ntaus yog leej twg. Nws tus hluas nraug, los ntawm txoj kev, muaj ib tug zoo ntaus ntawv, thiab daim duab yog li ntawd pumped. Lawv lub cev zoo saib.
Qhov tseem ceeb tshaj plaws rau cov ntxhais yog xav tias lawv muaj nuj nqis, hnov cov lus zoo siab rau lawv lub siab thiab tsis txhob maj. Nws tseem yuav hais tias Yog, tsuas yog nws yuav yog nws xaiv. Yog li tus neeg txawv teb chaws tau ua tiav kev tshaj lij - rau qhov nws tau txais qhov khoom plig. Thiab nws yog ib tug txiv mis zoo.