Nag hmo, tus nqi lag luam hauv tsev ntawm dichloromethane tseem ruaj khov thiab poob qis, thiab huab cua kev lag luam hauv khw zoo li qub.

Txawm li cas los xij, tom qab tus nqi poob qis, qee cov tub lag luam thiab cov neeg siv khoom txuas ntxiv ua cov xaj, thiab cov khoom lag luam tseem pheej poob qis vim yog qib qis thaum chiv thawj.

Piv rau sab qab teb, cov lag luam hauv zos hauv Shandong muaj cov khoom muag tsawg, tab sis tag nrho cov kev ua haujlwm ntawm cov chaw teeb tsa hauv kev ua lag luam yog siab. Tam sim no, tshwj tsis yog thaj tsam Jiangxi, ntau thaj tsam tseem qhia txog qhov xwm txheej ntau dhau, thiab lub siab ntawm cov neeg ua haujlwm tsis zoo siab.