They are swimming in the sea
海里───in the sea;游泳───Swimming
The drift of the icebergs in the sea endangers the ships.───海上冰山的漂流危及船只的安全.
On a hot day a dip in the sea is sheer paradise.───热天洗个海水澡是十分令人惬意的事.
I like to swim, especially in the sea.───我喜欢游泳, 尤其喜欢在大海中游泳.
The weary walkers soothed their aching feet in the sea.───走累了的人们把脚伸进海水中浸泡以缓解疼痛。
I like to bathe in the sea.───我喜欢洗海水浴.
The bombs fell in the sea, many too close for comfort.───那些炸弹落进了海里，很多落得太近而使人不安。
Pilchards are small fish that live in the sea───沙丁鱼是生活在海中的小鱼。
The wild weather did not deter some people from swimming in the sea.───尽管风雨交加，一些人还是会下海游泳。
She never swims in the sea.
There are as good fish in the sea as ever came out of it.
I like to bathe in the sea.
There's as good fish in the sea as ever came out of it.
The waste was dumped in the sea.