Sea - based missile defense tests have been more successful than tests of the land - based interceptor system the pentagon has deployed in alaska and california 海上导弹防御演习比五角大楼部署在阿拉斯加和加利福尼亚陆地导弹拦截系统更加有效。
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It is the first time a u . s . ally has taken part in a sea - based missile defense test after tokyo agreed to develop missile defense technology with america last year 这是自去年东京答应美国联合研发导弹防御技术后，美国联盟首次参加海上导弹防御演习。
