Hlau nplaum qhia
Cov hlau nplaum yog hais txog cov khoom siv lossis cov khoom siv uas tuaj yeem tsim qhov chaw sib nqus. Nws yog cov khoom peculiar. Nws muaj lub zog pom uas tuaj yeem rub tawm qee yam thiab tawm hauv qee yam khoom tawm. Feem ntau muab faib ua cov hlau nplaum ruaj khov thiab cov hlau nplaum mos.
Cov hlau nplaum muaj ob sab ncov qaum, hlau nplaum sab qaum teb N thiab hlau nplaum sab qab teb S. Tom qab txiav tawm, nws tseem yog ob-ncej N-theem thiab S ncej. Tsis muaj ib tug ncej yuav muaj nyob. Nyob rau tib lub sijhawm, cov hlau nplaum yog qhia. Yog tias koj dai cov hlau nplaum, koj yuav pom tias nws cov ncej sab qab teb taw rau sab laug thiab sab xis ntawm lub teb chaw sib nqus, thiab sab qaum teb ncej taw qhia rau sab laug thiab sab xis ntawm thaj av qaum teb sib nqus.