Lub npov hleo yog ib ntu ntawm cov chav huv uas tso cai hloov chaw ntawm ob qhov chaw sib txawv ntawm qhov tsis huv, Qhov ob thaj chaw no tuaj yeem ua ob chav huv lossis thaj chaw tsis huv thiab chav huv, Kev siv lub thawv tso tawm kom tsawg ntawm cov tsheb khiav hauv thiab tawm ntawm chav huv. uas txuag hluav taws xob thiab txo qis kev pheej hmoo ntawm kev sib kis. Cov thawv hla dhau feem ntau pom nyob rau hauv chaw soj ntsuam tsis huv, khoom siv hluav taws xob. cov tsev kho mob, chaw tsim khoom siv tshuaj, chaw tsim khoom noj khoom haus thiab dej haus, thiab ntau lwm cov chaw tsim khoom huv thiab kev tshawb fawb.