Raws li cov kev xav tau tshwj xeeb thiab kev pheej hmoo ntawm cov roj teb, thaj tsam ntawm peb caug mus rau tsib caug meters nyob ib ncig ntawm lub qhov dej yog suav tias yog qhov tseem ceeb.
Tseem, hauv kev xyaum, yuav luag txhua yam khoom siv hluav taws xob uas siv rau hauv qhov chaw zoo yog tawg-pov thawj. Tus qauv no zam qhov tsis tsim nyog hassles cuam tshuam nrog kev sib pauv cov khoom siv uas tsis ua raws li cov lus qhia tshwj xeeb tawg.