美人鱼的英语翻译是 "mermaid"。这个词来源于两个英语单词："mer"，意为海洋，和 "maid"，意为女子。所以，"mermaid" 就是指一种半人半鱼的海洋生物。

一些英文例句如下：

The mermaid swam gracefully through the water.

Many sailors have claimed to have seen mermaids over the years.

The mermaid's tail sparkled in the sunlight.