For example, "you are a lucky dog" means you are a lucky person.

例如，“you are a lucky dog”意思是你是个幸运的人。

You are a lucky dog.

你真是个幸运儿。

You are a lucky dog!

你真是幸运儿啊！

Really? You are a lucky dog. You know, many girls dream of dating him.

真的吗？你真是太幸运了。很多女孩子都渴望跟他约会呢。