Cov mill mills ua haujlwm nyob rau hauv siab zoo yuav emit hmoov thiab ua rau qias neeg ib puag ncig ntawm thaj chaw uas tsis kaw kom nruj; Nyob rau tib lub sijhawm, nws tseem ua tau rau hmoov rau qhov khoob ntawm cov chaw sib hloov, yog li ntawd, thiab ua rau muaj kev tiv thaiv cov raj ntawm cov thee ntawm cov cua ntim cov cua feem ntau yog siv cov tshuab hluav taws xob me me, thaum siv cov kiv cua tshwj xeeb, nws tseem tuaj yeem ua cov ntxuam sib khi ua ke.
