Raws li cov ntaub ntawv luam tawm, yas zaj duab xis rau cov hnab ntim khoom noj muaj keeb kwm luv luv. Nws muaj qhov zoo ntawm lub teeb, pob tshab, noo noo tsis kam, oxygen tsis kam, airtightness, toughness thiab folding kuj, du nto, thiab tiv thaiv cov khoom, ...
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