0 the salty water that covers a large part of the surface of the earth, or a large area of salty water, smaller than an ocean, that is partly or completely surrounded by land -- 海，海洋
the Mediterranean Sea 地中海
We went swimming in the sea. 我們去海裡游泳。
The sea was calm/smooth/choppy/rough when we crossed the Channel. 當我們橫渡海峽時，海上風平浪靜／水平如鏡／波浪起伏／波濤洶湧。
The refugees were at sea (= in a boat on the sea a long way from land) for 40 days before reaching land. 難民在海上度過了40天才到達陸地。
When we moved to the US, we sent our things by sea (= in a ship). 我們移民美國時，把行李海運了過去。
We spent a week by the sea (= on the coast) this year. 我們今年在海邊度過了一個禮拜。
Soon we had left the marina and were heading towards the open sea (= the part of the sea a long way from land). 不一會兒，我們便離開了小艇停靠區，向外海駛去。
The teacher looked down and saw a sea of smiling faces. 老師向下看去，看到一張張微笑的臉龐。
The boats will put (out) to sea on this evening's high tide. 船將在今晚漲潮時啓航。
Redundant mechanisms of calcium-induced calcium release underlying calcium waves during fertilization of sea urchin eggs.
The model assumes constant tectonic subsidence and a random variation in sea level.
The subject of sea level rise is surrounded by uncertainties.
