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1.expire v. （文件、协议等）（因到期而）失效，终止；到期
例句：He had lived illegally in the United States for five years after his visitor's visa expired.
在访问签证到期后，他又在美国非法居住了5年。
2.surgery n. 外科手术；外科学
例句：His father has just recovered from heart surgery.
他父亲刚刚从心脏外科手术中康复过来。
