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. 我们去海里游泳。
The sea was calm/smooth/choppy/rough when we crossed the Channel. 当我们横渡海峡时,海上风平浪静/水平如镜/波浪起伏/波涛汹涌。
The refugees were at sea (= in a boat on the sea a long way from land) for 40 days before reaching land. 难民在海上度过了40天才到达陆地。
When we moved to the US, we sent our things by sea (= in a ship). 我们移居美国时,把行李海运了过去。
We spent a week by the sea (= on the coast) this year. 我们今年在海边度过了一周。
Soon we had left the marina and were heading towards the open sea (= the part of the sea a long way from land). 不一会儿,我们便离开了小艇停靠区,向外海驶去。
The teacher looked down and saw a sea of smiling faces. 老师向下看去,看到一张张微笑的脸庞。
The boats will put (out) to sea on this evening's high tide. 船将在今晚涨潮时启航。
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.