Lub qhov rooj tua hluav taws tau nruab nrog cov pa taws thiab ntsuas qhov ntsuas kub, uas tuaj yeem txheeb xyuas thiab kuaj tau raws sijhawm thaum hluav taws tshwm sim, ceeb toom yuav raug tshaj tawm, thiab cov kev ntsuas tiv thaiv hluav taws yuav raug coj los siv. Cov khoom pov thawj hluav taws kub thiab cov qhov rooj tiv thaiv hluav taws yog muab rau hauv cov khw loj loj thiab cov khw muag khoom loj rau kev lag luam.