only 是个焦点副词。在句中放在哪个词前就强调哪个词。

如果是单独一个名词或代词，则可以放在之后。例如：

以下两句，only 都是强调 Tom，但位置不同：

Only Tom can do it. 

Who else did you see? ---Tom only.

Rome does not refer to the city of Rome. Roma only. It refers to the Roman empire that is the great country that Rome built more than 2000 years ago.

【翻译】Rome 不是指罗马城。只是罗马帝国。它指的是罗马帝国，是罗马在2000多年前建立的伟大国家。