(1) Lub tshuab nqus tsev cia khoom ua kom lub neej txee ntawm cov khoom.
(2) Pob tshab Windows tso cai rau cov neeg siv khoom pom cov khoom sab hauv.
(3) Txo cov oxidation tus nqi ntawm cov zaub mov, inhibit qhov kev loj hlob ntawm cov kab mob khoom.
(4) Tear notch ntxiv kom nws yooj yim qhib.