Cov tshuaj zoo yog cov tshuaj tau los ntawm kev ua cov khoom siv tshuaj lom neeg ntxiv. Lawv yog cov yam ntxwv ntawm lawv cov ntau yam, cov ntsiab lus thev naus laus zis siab, thiab tus nqi ntxiv. Lawv suav nrog cov tshuaj lom neeg nruab nrab zoo thiab cov tshuaj tshwj xeeb. Cov no yog cov tseem ceeb thiab cov ntaub ntawv tseem ceeb rau lub teb chaws kev lag luam, nrog rau cov khoom tsim nyog thiab cov khoom siv rau tib neeg lub neej.
