(1)海(洋)(salty water that covers a large part of the earth's surface，ocean)[U，the～，pl]：swim in/sail on/flow into the～在海里游泳/在海上航行/流入大海;the animals and plants living in the～ 生活在海中的动植物;the smooth/calm/rough/choppy～ 平平静静/风平浪静/浪涛汹涌/波涛翻滚的大海;in warm/cold/quiet～在温暖/寒冷/平静的海水中;the tropical～热带海域;travel by (fly over) land and～走陆路和海路旅行(飞越陆地和海洋);the bottom/surface of the～海底(面);head towards the open～朝外海驶去;have the right to sail on the high～s有权在公海航行;sail the～s 航海;sail into quieter～s 驶入较平静的海域;a～animal/fish/bird 海洋生物/海鱼/海鸟;a～route/shell 海路/贝壳;～water/food/travel/traffic海水/海鲜/海上旅游/海上交通;〖同〗ocean，waters，deep;〖反〗land;

(2)(比洋小的水域)海(particular area of water，smaller than an ocean (used as a part of a proper name))[C](常cap)：the Mediterranean /Caribbean /South China /Baltic/North/Black S～ 地中海/加勒比海/南中国海/波罗的海/北海/黑海;

(3)内海，淡(咸)水湖(large body of fresh or salt water partly or completely surrounded by land)[C]：the S～of Aral/of Galilee咸海/加利利海;the Caspian/Dead S～里海/死海;

(4)海浪(condition of the ocean's surface with regard to its waves or swells)[C，常pl]：a calm/light/big/stormy/turbulent/heavy～风平浪静/风浪不大/大浪滔天/风急浪高/波涛汹涌/巨浪滔天的海面;The ship foundered in/ran into/encountered mountainous～s.船只遭遇排山巨浪。〖同〗wave，flood;

(5)大量(片)的(vast extent;a lot of)[C][N(of)](fig)：a～of ice/mud/flame/corn 一大片冰/泥沼/火海/庄稼;the～of faces数不清的脸;a～of trouble/complains大量问题/无穷抱怨;The fields were a～of beautiful wild flowers in spring.春天的原野是野花的海洋，十分漂亮。〖同〗flood，mass;

at sea 1)在海上(的轮船等之上)：a storm/submarine at～海上的风暴/海面上的潜艇;staying at～for several months在海上数月; 2)茫然，不知所措：When it comes to mathematics，I'm completely at～.一涉及数学，我就不知所措。an old man who was all at～with the new coins.对新硬币感到茫然的老人;

beyond/over the sea(s)在(到)海外(fml)：our friends beyond the～我们海外的朋友;living beyond the～for many years 在海外生活多年;

by the sea在海边(滨)：enjoy one's day/a pleasant weekend by the～在海滨好好过一天/一个愉快的周末;

go/run away to sea当水手：As a boy his great ambition was to go to～.他儿时的远大抱负就是当水手。

on the sea 在海岸边：Brighten is on the～.布赖顿是一座海滨城市。

put (out) to sea启航，出海：The ship was unable to put out to～on account of the gale.船只因狂风不能出海。

→′sea-bird n 海鸟;′seaboard n 沿海地区，海滨;′sea-borne adj 海运的;′sea-bream n欧鳊(一种鲤科的淡水鱼);′sea-breeze n 海风;′sea-cow n 海牛;′sea-dog n 老水手;′seafarer n 水手，海员;′seafaring adj 航海的，海上工作的;′seafood n 海味;′seagoing adj 远洋航行的;′sea-green adj 海绿色的;′seagull n 海鸥;′sea-horse n 海马;′sea-kale n 海甘蓝;′sea-legs n 在甲板上行走自如;′sea-level n 海平面;′sea-lion n 海狮;′seaman n 水兵，水手;′seamanship n 船舶驾驶术;′sea-pink n海石竹(沿海或高山植物，开鲜艳的粉红色花);′seaplane n 水上飞机;′seapot n 海港市镇;′seascape n 海景画;′sea-shore n 海岸，海滨;′seasick adj 晕船的;′seaside n 海滨;′sea-urchin n 海胆;′sea-wall n 海堤;′sea-way n 航线，航行;′seaweed n海藻(草);′seaworthy adj 适于航海的;′sea-shell n 贝壳;′seawards adv 朝海，向海