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Từ điển Oxford Advanced Learner 8th
molehill
mole·hill [molehill molehills] BrE [ˈməʊlhɪl] NAmE [ˈmoʊlhɪl] noun a small pile of earth that a ↑mole leaves on the surface of the ground when it digs underground see make a mountain out of a molehill at ↑mountain
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