/si:; si/
n
1 (often 常作 the sea) [U] (also seas [pl]) the salt water that covers most of the earth's surface and encloses its continents and islands; any part of this, in contrast to areas of fresh water and dry land 海; 海洋
*fly over land and sea 飞越陆地海洋
* travel by sea 乘船过海
* sail the seas 航海
* the high seas, ie parts away from the land, where no single country can impose its laws 公海
* the cold sea(s) of the Antarctic 南极冰冷的海洋
* Most of the earth's surface is covered by (the) sea. 地球表面大部分是海洋.
* Ships sail on the sea. 轮船能在海上航行.
* Fish swim in the sea. 有些鱼生活在海洋里.
* The river flows into the sea near Portsmouth. 这条河在朴次茅斯附近入海.
* [attrib 作定语] a sea animal, fish, voyage 海洋动物、海鱼、海上航行.
2 (often Sea, esp as part of a proper name 常大写作Sea, 尤用于专有名称) [C]
(a) particular area of the sea, smaller than an ocean 海（比洋小的水域）
*the Mediterranean Sea 地中海
* The Caribbean Sea 加勒比海
* the South China Sea 中国的南海.
(b) large inland lake of fresh water or salt water 内海, 湖（可为淡水或咸水）
*the Caspian Sea 里海
* the Sea of Galilee 加利利海.
3 [C] (also seas [pl]) (state or movement of the) waves of the sea 海浪（的起伏状况）
*a heavy/light sea, ie with big/small waves 浪大的[小的]海面
* The ship was struck by a heavy sea, ie a large wave. 那艘船遇到了巨浪.
* The liner foundered in heavy seas. 那艘班轮遇到巨大海浪而沉没.
4 ~ of sth (fig 比喻) large amount of sth covering a large area 在大范围中的大量事物
*I stood amid a sea of corn. 我站在茫茫一片庄稼之中.
* The lecturer looked down at the sea of faces beneath him. 讲演的人俯视着下面无数的面孔.
5 (idm 习语) at `sea
(a) on a ship, etc on the sea 在海上的轮船等之上
*spend three months at sea 在海上度过了三个月.
(b) not knowing what to do; confused 不知所措; 茫然; 糊涂
*I'm all at sea; I've no idea how to repair cars. 我手足无措, 不知道怎样修理汽车.
* She tried to understand the instructions, but she was completely at sea. 她费尽力气想 看懂那些说明文字, 却全然不知所云. between the devil and the deep blue sea => devil1. beyond/ over the `sea(s) (fml or rhet 文或修辞) to or in countries on the other side of a sea or seas; overseas; abroad 到海外; 在海外
*our cousins beyond the seas 我们那些在海外的表兄弟姐妹. go to `sea be a sailor 当水手. on the `sea at the seaside 在海边; 在海滨
*a town on the sea in Devon 在德文郡海边的市镇
* Mudford-on-Sea, ie as a place-name 穆德福特海滨. put (out) to `sea leave port or land travelling on a ship, etc （离港或离岸）出海, 起航. the seven seas (rhet 修辞) all the seas of the world 七大洋
*He's sailed the seven seas in search of adventure. 他闯荡七大洋去历险. there are more/other fish in the sea => fish.

n
[Language: Old English;Origin: sA]
[singular, U]
the large area of salty water that covers much of the earth's surface
= ocean
　Jay stripped his clothes off and ran into the sea.
　All the rooms have sea views.
　The sea was perfectly calm .
　the rough seas and wild winds that buffeted the coast
　They headed west toward the open sea .
　Most exports went by sea .
　a little cottage by the sea
　He spent over 30 years at sea .
　They stood side by side looking out to sea .
　a sailor who was lost at sea
　He went to sea when he was eighteen.
　The refugees put to sea in five rickety rafts.
　Divers have disturbed the sea bed in some areas.
　She's out enjoying the sea air .
[C]
a large area of salty water that is mostly enclosed by land
　the Mediterranean Sea
sea of sth
a very large number of people or things that all look similar
　He looked out at the sea of faces.
(all) at sea
confused or not sure what to do
　Living in a foreign country can mean you're always at sea about what's going on.
the seas
literary the sea - used especially when you are not talking about a particular ocean
across the seas
(=far away)
　They came from lands across the seas.
[C]
one of the broad areas that seem flat on the moon and Mars

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COLLOCATES for sense 1
calm sea (=without large waves)
rough sea(s)/heavy seas (=with large waves)
the open sea (=part of the sea far away from land)
by sea (=on a ship)
by the sea (=on the coast)
at sea (=working on ships)
out to sea (=away from the land)
be lost at sea (=be drowned)
go to sea (=go to work on a ship)
put to sea (=make a boat go out to sea)
seawater
seabed/floor (=the land at the bottom of the sea)
sea air (=the air at the coast)

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