Cov cuab yeej yooj yim tswj "kua dej"
Kev tswj xyuas kev nyab xeeb thiab kev tsim khoom muaj xws li roj to, dej to, chav dej, pa taws, pa taws to, tshauv to, thee to, hmoov to thiab gas to, uas yog qhov peb hu ua "khiav, emission, dripping thiab to". Niaj hnub no, peb nthuav qhia s ...
saib kom meej