慢速英语:Obama: No ‘Quick Fixes’ in Fight against Islamic State

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defeat – v. to cause to lose in a battle or struggle; n. a loss; the condition of having lost

militant – n. someone active in trying to cause political change, often by the use of force or violence

campaign – n. a connected series of military actions during a war

threat – n. a warning that one will do harm or cause damage

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