1, tso cov khoom siv nrog cov txee, siv cov chaw lag luam tsis zoo, siv cov khoom lag luam zoo, kom cov neeg tau txais kev pom zoo, cov khoom xa tuaj rau cov neeg tuaj yeem, los ntawm cov khoom xa tawm ntawm cov khoom muag, tsim kho thiab ntxiv dag zog rau kev txiav txim siab muas, tab sis kuj yog tus kws pabcuam hauv khw los muab cov neeg tuaj yeem nrog ib tus qauv siab ntawm kev pabcuam cov haujlwm khiav lag luam.
2, saib cov khoom siv nrog cov txee, muaj peev xwm zoo moistureproof, dustproof, anti-tub sab, tiv thaiv kev puas tsuaj thiab lwm yam kev ntsuas los txhim kho qhov zoo ntawm cov khoom cia.