VOA慢速英语:Japan Demands That Islamic State Release Hostages

release - v. to free; to permit to go;

hostages - n. people captured and held as a guarantee that a demand or promise will be honored

coalition - n. forces, groups or nations joined together

estimate - n. a value, size or amount based on less than complete information

economy – n. the system by which money, industry and trade are organized

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