在大海里的英文表达有很多种，其中一种常用的表达是 "at sea"。
"At sea" 来源于英文动词 "to be at sea"，意思是 "在海上，在航行中"。它的词源可以追溯到古英语 "sæ"，意思是 "海"。
例句：
"The ship is at sea right now." (这艘船现在正在海上航行。)
"We spent two weeks at sea on our honeymoon cruise." (我们在蜜月邮轮上度过了两周海上假期。)
"The sailors were at sea for months before they returned home." (这些水手在海上航行了几个月之后才回到家。)
另外，"in the sea" 也可以表示 "在大海里"，例如：
"We saw dolphins swimming in the sea." (我们看到海豚在大海里游泳。)
"There are many different types of fish in the sea." (大海里有许多不同种类的鱼。)
"At sea" 来源于英文动词 "to be at sea"，意思是 "在海上，在航行中"。它的词源可以追溯到古英语 "sæ"，意思是 "海"。
例句：
"The ship is at sea right now." (这艘船现在正在海上航行。)
"We spent two weeks at sea on our honeymoon cruise." (我们在蜜月邮轮上度过了两周海上假期。)
"The sailors were at sea for months before they returned home." (这些水手在海上航行了几个月之后才回到家。)
另外，"in the sea" 也可以表示 "在大海里"，例如：
"We saw dolphins swimming in the sea." (我们看到海豚在大海里游泳。)
"There are many different types of fish in the sea." (大海里有许多不同种类的鱼。)