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oceanic + noun
形容词用法，作定语修饰名词，表示“海洋的、生活在海洋中的、产于海洋的”。
Oceanic fish migrate over long distances in the open sea.
海洋鱼类在开阔的大海中长途迁徙。
海洋的；产于海洋的；生活在海洋中的
先理解核心含义，再看它在真实句子里的用法。
海洋的；产于海洋的；生活在海洋中的
relating to, occurring in, or living in the open ocean
Oceanic fish migrate over long distances in the open sea.
海洋鱼类在开阔的大海中长途迁徙。
海洋的；与海洋有关的。
Of or relating to the ocean.
大洋洲的；大洋洲人的。
Of or pertaining to Oceania; Oceanian.
栖居海洋的、海洋产生的或常出没于海洋的。
Living in, produced by, or frequenting the ocean.
南岛语系海洋语族的。
Of the Oceanic branch of the Austronesian language family.
The crew studied the oceanic currents before setting sail across the Pacific.
船员们在启航横渡太平洋之前研究了洋流。
Many oceanic species, such as tuna and dolphins, spend their entire lives in the open sea.
许多海洋物种，如金枪鱼和海豚，终生生活在开阔的大海中。
The view from the cliff gave us a sense of oceanic vastness that words cannot capture.
从悬崖上望去，我们感受到一种言语无法形容的海洋般辽阔。
形容词用法，作定语修饰名词，表示“海洋的、生活在海洋中的、产于海洋的”。
Oceanic fish migrate over long distances in the open sea.
海洋鱼类在开阔的大海中长途迁徙。
形容词用法，作表语，表示“海洋性的；广阔的、无垠的”。
The climate on this island is mild because it is oceanic.
这座岛屿气候温和，因为它是海洋性气候。
名词用法，指该语族；作为专有名词时间或首字母大写。注意该词形容词是普通名词前的定语，名词则用于指称整个语族。
Oceanic is an eastern subfamily of Malayo-Polynesian languages.
海洋语族是马来-波利尼西亚语系的一个东部亚族。
Not this
The oceanic is deep and mysterious.
Use this
The ocean is deep and mysterious.
oceanic 是形容词，不能充当名词主语；表示“海洋”须用名词 ocean。
Not this
Many fish live oceanic.
Use this
Many fish live in the ocean.
live 是不及物动词，不能直接接形容词作地点；表示“在海里生活”要用介词短语 in the ocean。
Not this
Australia is an oceanic country.
Use this
Australia is an Oceanian country.
表示“大洋洲的”应用 Oceanian；oceanic 只表示“海洋的、海洋中的”，没有“大洋洲的”含义。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
海洋性气候
London has an oceanic climate.
伦敦属于海洋性气候。
海洋地壳
Oceanic crust is continuously created at mid-ocean ridges.
海洋地壳在大洋中脊持续生成。
海沟
Subduction creates deep oceanic trenches.
板块俯冲会形成很深的海沟。
海洋岛屿
Hawaii is an example of oceanic islands formed by volcanic activity.
夏威夷是火山活动形成的海洋岛屿之一。
远洋带；大洋区
The oceanic zone is the deep water beyond the continental shelf.
远洋带是指大陆架之外的开阔深水区。
远洋物种
Some oceanic species rarely approach the coast.
有些远洋物种很少靠近海岸。
Use oceanic naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
ocean（海洋）+ ic（形容词后缀）→ 海洋的；想象无边无际的大洋，广阔无垠。
语域：neutral 常见场景：oceanography、environmental science、literary description 多用于书面或科学语境，日常口语中较少用。表示“海洋的”时常见于科技、地理描述；表示“广阔的、无垠的”时带文学色彩。
Genuine rhymes with oceanic: volcanic, titanic, satanic, mechanic, organic — all are stressed on /ænɪk/. Beware lookalikes: maniac is pronounced /ˈmeɪniæk/, not /ˈænɪk/, and ocean (/ˈəʊʃən/) begins similarly but doesn't rhyme.
Dictionary facts from ECDICT, WIKTIONARY.