朝鲜周四宣布朝韩间所有经济合作交流协议全部无效，同时朝方将彻底清算朝鲜境内的韩国企业和相关机构的所有资产。请看本报周五的报道：

    North Korea on Thursday nullified all agreements on economic cooperation and exchanges with South Korea, and said it would liquidate South Korean assets left behind in the Kaesong industrial zone and Mount Kumgang tourist zone in its territory.

    South Korea’s unification ministry said Thursday such unilateral claims by Pyongyang can never be accepted.

    A statement by a spokesman for North Korea’s Committee for Peaceful Reunification of Korea said the plan was made in response to a series of unilateral sanctions by Seoul on North Korea after the U.N. Security Council voted to adopt a tough resolution against Pyongyang.

    报道中的nullify就是“废除”，null可以作名

    词、形容词和动词，就是“零、无效的、宣布无效”。例如：

    He stepped down as president in September, but is now demanding his company nullify the resignation.

    去年九月他卸任总裁，现在却要求公司宣布他的辞呈无效。