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Từ điển Oxford Advanced Learner 8th
stepladder
step·lad·der [stepladder stepladders] BrE [ˈsteplædə(r)] NAmE [ˈsteplædər] noun 
a short ↑ladder that is made of two parts, one with steps, that are joined together at the top, so that it can stand on its own or be folded flat for carrying or storing
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