Ua ntej, cov tsos mob tshwm sim: sib piv 2 meters ntawm tus qauv, nyob rau hauv qhov chaw uas muaj teeb pom kev, pom kev pom ntawm sab npoo ntawm daim ntaub nrog cov xaim tawg, tawv tawv thiab lwm yam tsis tsim nyog. Nyob rau tib lub sijhawm, xyuam xim rau seb qhov teeb meem sib kis ntawm cov ntaub saum npoo yog qhov zoo ib yam (qhov no yog qhov tseem ceeb thiab cov qauv yooj yim los txiav txim siab qhov sib thooj ntawm daim ntaub saum npoo). Tom qab ntawd kis rau ntawm ib qho chaw tiaj tiaj, tusyees faib cov khoom lag luam, cov ntaub yuav tsum tsis muaj kev sib tsoo, thiab yog tias koj yog, koj muaj teeb meem thaum ua cov ntawv.
Thib ob, qhov ntsuas lub cev ntawm daim ntaub: saib xyuas seb daim ntaub saum npoo yog qhov ci. Tsis muaj cov fibers ntab rau saum npoo, yog tias tsis muaj npub lossis ntau ntab, nws feem ntau yog tsim los ntawm cov khoom xa rov qab. Tee ib daim ntaub, hlawv nws kom tiav nrog hluav taws, saib cov roj hlawv pov tseg, cov khoom lag luam zoo, muaj cov khoom seem thiab tiaj tiaj, cov khoom siv theem ob yog tsim, cov khoom seem muaj ntau qhov me me ntawm hmoov av. Yog tias lub sijhawm tso cai, koj tuaj yeem siv sijhawm ntev li ib lub 'meter' ntawm lub hnub, "Li Gui" tsis muaj peev xwm tiv thaiv ultraviolet lub tshav ntawm lub hnub, yuav muaj kev hloov pom tseeb tom qab 7 hnub, nrog txhais tes los kua muag, nws yooj yim li los kua muag raws li ntawv.
