Kev txiav txim siab yuav khoom
1. Xaiv qhov hluav taws xob laum loj. Raws li qhov loj ntawm lub tshuab raj hluav taws xob nce, tus nqi yuav nce raws li. Qhov luaj li cas ntawm tsev neeg laum hluav taws xob feem ntau yog 20 hli.
2. Kev xaiv ua haujlwm ntxiv rau ntawm laum hluav taws xob: Muaj qee qhov haujlwm ntxiv rau tib lub qauv. Piv txwv, yog tias tus qauv muaj R, nws txhais tau tias lub laum tuaj yeem hloov rov qab. Qhov zoo dua yog tias thaum kev sib hloov pem hauv ntej tsis tuaj yeem hloov kho, nws tuaj yeem hloov pauv kom thim rov qab; E txhais tau hais tias lub laum tuaj yeem hloov kho kom nrawm thiab tuaj yeem hloov kho mus rau qhov chaw qis qis thaum tsis muaj kev kub ceev.
3. Thaum koj pom kev nce qib ntawm qhov hluav taws xob kev teeb tsa hauv cov rooj tog hauv khw, tsis txhob kub dhau, yuav nws tam sim ntawd, nyob ntawm seb nws puas muaj siv.
