Baetsi ba li-valve tse tsebahalang tsa heke: matla a ho haha marang-rang
Ka ho potlakisa ts'ebetso ea ts'ebetso ea indasteri, indasteri ea li-valve ho nts'etsopele ea moruo oa China e ntse e ba bohlokoa le ho feta, har'a eona, valve ea heke e le lekala la bohlokoa la indasteri ea li-valve, ts'ebeliso ea eona ho matla, petrochemical, metsi ...
lintlha tsa pono