Seem seem yog qhov chaw uas siv los tiv thaiv cov kua dej, roj av lossis hmoov av los ntawm kev cuam tshuam los ntawm cov kev cuam tshuam ntawm cov khoom siv. Cov khoom no ua cov cuab yeej tseem ceeb hauv cov cuab yeej tseem ceeb hauv cov cuab yeej siv cov khoom siv kho mob, tiv thaiv cov haujlwm ib txwm muaj ntawm cov cuab yeej thiab tiv thaiv kev puas tsuaj ib puag ncig. Sealing seem yog dav siv nyob rau hauv cov tshuab, tsheb, aviation, nkoj thiab lwm thaj teb.
