慢速英语:将军被美国杀死 伊朗最高领袖誓言复仇

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instability –n. a state of being likely to change quickly

region –n. an area of land different from other for a particular reason

revenge –n. doing something to hurt someone because they did something to hurt you

relevant –adj. relating to a subject in an effective way

escalation –n. to become more intense or more severe