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1.Sequence IV is Pliocene sea-onshore transition grayer, grayish gritstone, siltstone and mudstone and becomes thicker sea facies toward trough.
层序IV，为上新统海陆过渡相的灰白、浅灰色砂砾岩、粉砂岩、泥岩，往冲绳海槽方向增厚，变为海相。收藏指正
2.It will gradually perfect the multi-functional force of marine supervision and law enforcement personnel so as to form an integrated air, sea and onshore marine surveillance and management system;
--逐步完善多职能的海上监察执法队伍，形成空中、海面、岸站一体化海洋监察管理体系；收藏指正
3.The database includes ten sites from locations in the Atlantic Ocean, the North Sea, the Norwegian Sea, the Caspian Sea and two onshore sites.
该数据库由10个场地组成,包括大西洋、挪威北海、挪威海、里海和2个沿海陆上地点。收藏指正
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同义词辨析
这两个名词均可表示“海，海洋”之意。
sea : 普通用词，可用复数形式表单数意义。sea所指的面积要比ocean小得多。sea也可是ocean的一部分。
ocean: 指把海作为一个整体，是海洋的总称，不可数名词，指大洋时是可数名词。