Nws yog ib tsob nroj tin tsim hauv Tajikistan los ntawm Suav tuam txhab npe Henan Yu mining pab pawg. Vim tias cov neeg siv khoom nruj heev hauv kev yuav khoom, lawv yuav luag tau mus xyuas tag nrho lub ntiajteb txawj nqus concentration cov cuab yeej tsim khoom thiab thaum kawg peb cov neeg siv khoom xaiv peb ua lawv tus neeg muag khoom vim peb cov khoom zoo thiab zoo heev tom qab- kev muag khoom. Qhov kev txiav txim no muaj 60sets Yunxi tuav cov rooj thiab peb cov kws tshaj lij tau ua tiav qhov kev teeb tsa thiab kev ua haujlwm lawm.
