Some people have seen the sea, but others haven't. The sea looks beautiful on a fine day. But it can be very rough when there is a strong wind.
有些人见过大海，可是另一些人没见过。在晴朗的日子，大海看起来很美，可是在刮大风时，大海很粗暴。

The sea is very large. There is more sea in the world than land.
海很大。世界上的海洋比陆地大的多。

If you have swum in the sea, you know that the sea is salty. Do you know the Dead Sea? It is so salty that you can't sink when you are in the water. And fish can't live in it!
如果你曾在大海中游过泳，你就知道海水是咸的。你知道死海吗？那里的水很咸，当你在水中时，你不会沉下去。鱼在那儿不能生存。

词组解析：
1.beautiful：美丽的
2.rough：粗暴的
3.strong：强劲的
4.wind：风
5.salty：咸的
6.sink：下沉