1 oftenthe sea [U] the salt water that covers large parts of the surface of the earth 海；海洋: The sea is quite calm/rough today. 今天海面颇为平静╱波涛汹涌。Do you live by the sea ? 你住在海边吗？to travel by sea 乘船旅行There were several people swimming in the sea. 有几个人在海里游泳。 ☞picture on page C8 见C8页插图

2 oftenSea [C] a particular large area of salt water. A sea may be part of the ocean or may be surrounded by land. 海；海洋中的一片水域；内海: the Mediterranean Sea 地中海the Black Sea 黑海 ☞Look at ocean. 参看ocean。

3 [sing] (also seas [pl]) the state or movement of the waves of the sea 海面状况；海浪: The boat sank in heavy (= rough) seas off the Scottish coast. 那船在苏格兰近海遇上巨浪，沉没了。

4 [sing] a large amount of sb/sth close together 紧靠一起的大批人或事物

1 sailing in a ship 航行；航海: They spent about three weeks at sea. 他们在海上航行了大约三个星期。

2 not understanding or not knowing what to do 茫然；困惑；不知所措