Lub khob thermos yog ib hom khob, yog tias koj muab dej kub tso rau hauv nws, nws yuav ua kom kub rau lub sijhawm, uas yog qhov tsim nyog rau lub caij ntuj no, txawm tias koj muab tawm los, koj tuaj yeem haus dej kub. Tab sis qhov tseeb, lub khob thermos tsis tuaj yeem tso dej kub xwb, tab sis kuj yog dej khov, thiab nws tuaj yeem ua kom txias. Beca...
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