1
at sea
表示在海上航行或作业。
The sailors are at sea.
水手们正在海上。
海；海洋；大海
seas — plural of sea
先理解核心含义，再看它在真实句子里的用法。
海；海洋；大海
The salt water that covers most of the Earth's surface, or a large body of salt water partly enclosed by land.
The sailors are at sea.
水手们正在海上。
大片咸水水域
A large body of salt water.
部分被陆地包围的海洋或大面积咸水体
a division of an ocean or a large body of salt water partially enclosed by land
湖泊,尤其是大湖或咸水湖
A lake, especially if large or if salty or brackish.
看似无限的数量或体积的事物
anything apparently limitless in quantity or volume
We spent the afternoon swimming in the warm sea.
我们整个下午都在温暖的海水里游泳。
AI contextual example
The sea was calm, so the boat left the harbor early.
海面很平静，所以船很早就离开了港口。
AI contextual example
Many rivers flow into the sea.
许多河流流入大海。
AI contextual example
heavy seas
汹涌的海浪
WordNet
表示在海上航行或作业。
The sailors are at sea.
水手们正在海上。
表示海边位置。
They live by the sea.
他们住在海边。
比喻大量的人或物。
The stadium was a sea of flags.
体育场是一片旗帜的海洋。
表示进入海洋的方向。
The river flows into the sea.
这条河流入大海。
Not this
I love sea.
Use this
I love the sea.
英语中表示泛指海洋时，通常要用定冠词the，如the sea。中文‘海’可以单独用，但英语需要冠词。
Not this
I swam on the sea yesterday.
Use this
I swam in the sea yesterday.
表示在海里游泳，介词要用in，表示在水的内部。on the sea通常指在海上（如船航行），不用于游泳活动。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
在海边
I live by the sea.
我住在海边。
在海上
The ship is at sea.
船在海上。
海平面
The city is below sea level.
这个城市在海平面以下。
海水
Sea water is salty.
海水是咸的。
海风
We enjoyed the cool sea breeze.
我们享受了凉爽的海风。
海景
The hotel room has a sea view.
酒店房间能看到海景。
困惑，茫然
I'm all at sea with these new regulations.
这些新规定让我完全摸不着头脑。
一大片，大量的
The stadium was a sea of red and white flags.
体育场成了一片红白旗帜的海洋。
进退两难
She was caught between the devil and the deep blue sea when she had to choose between her job and her family.
她在工作和家庭之间做选择时陷入了进退两难的境地。
五𠵧深處你的父親長眠；他的骨頭已化為珊瑚；他的眼睛是珍珠；他身上的一切都不會消失，而是經歷海的變幻，變成富麗奇妙的東西。
Shakespeare's The Tempest uses 'sea-change' to describe a profound transformation.
莎士比亞的《暴風雨》用「海的變幻」來描述深刻的轉變。
在海的彼岸某處，某處在等著我，我的愛人站在金色的沙灘上，望著航行的船隻。
The song 'Beyond the Sea' by Charles Trenet (popularized by Bobby Darin) evokes longing and romance associated with the sea.
Charles Trenet創作、Bobby Darin唱紅的歌曲《Beyond the Sea》喚起與海相關的渴望與浪漫。
发长 /iː/ 音 (如 sea, tea)
Same pattern, same sound
Use seas naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
sea发音像see，联想‘看海’记住sea是海洋。
通常为中性语域，多用于日常及正式场合。
a sea of + 复数名词 表示“大量、无数”，sea 前常有 a。
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.
Watch the sound change