sea

Compared meaning: a huge amount, used for emphasis (noun).

比较义项：大量、许多（用于夸张地形容数量或程度之多，常构成“a(n) ocean/sea of...”结构）（名词）。

• ocean

  "An ocean of X" stresses an overwhelming, almost bottomless amount, typically with abstract or emotional nouns like debt, grief or information; it sounds more dramatic and literary than "a sea of X".

  “an ocean of + 名词”强调深不见底、令人窒息的量，常与抽象或情感类名词搭配，如债务、悲伤、信息，语气比“a sea of”更戏剧化、更书面。

  After the divorce, he found himself sinking in an ocean of debt.

  离婚后，他发现自己深陷于一片债务的汪洋之中。

• sea 本词

  "A sea of X" is the more common, everyday idiom, usually painting a visual scene of many similar things spread out, such as faces, umbrellas or paperwork.

  “a sea of + 名词”是更常见、更口语化的说法，通常描绘出许多相似事物铺展开来的画面，如脸庞、雨伞、文件，视觉感更强。

  Standing on stage, the singer looked out at a sea of cheering faces.

  站在舞台上，歌手望向台下一片欢呼的人海。

Ocean and sea both mean 'a huge amount', as in 'a/an ___ of'. Ocean sounds dramatic, for an overwhelming amount, like debt or grief. Sea is more common, describing many similar things spread out, like faces. Their literal meaning as water is not compared here.

这两个词都能用“a(n) ___ of + 名词”的结构来夸张地表示“大量、许多”，但语气和画面感略有不同：ocean 更强调深不可测、令人窒息的量，语气偏书面、戏剧化；sea 更口语化，常用来描绘许多相似事物铺展开来的视觉画面。这里不比较 ocean 和 sea 表示“海洋”本身的字面意义。