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Cov khoom no yog lub khob dej tshwj xeeb thiab muaj tswv yim.Cov khoom siv raw yog silica gel, uas muaj kev nyab xeeb thiab zoo ib puag ncig.Lub khob dej no me me thiab yooj yim nqa.Nws yog qhov tsim nyog rau kev lag luam thiab kev mus ncig.