Cov chaw soj ntsuam kuaj thiab cov chaw sim tau tsim los sim cov tsheb thauj khoom tshwj xeeb ua ntej xa khoom kom paub meej cov khoom zoo thiab cov neeg siv khoom ntseeg siab.
Cov chaw kuaj kev tshaj lij tso saib, suav nrog nce thiab nqis nce toj, kev sib txawv ntawm txoj kev, hlua pavement, pob zeb pavement, pebble pavement thiab lwm yam.
