RO

例句：

1. 1. 罗马数字
   Roman numerals
2. 2. 罗马语
   Romance
3. 3. 罗马共和国
   Roman Republic
4. 1. The ancient Romans used this system to count their territory.
   古罗马人使用这个系统来计数他们的领土。
5. 2. The Roman Empire was a powerful empirethat lasted for several centuries.
   罗马帝国是一个强大的帝国，持续了几个世纪。
6. 3. The Romans were known for their architecture and engineeringachievements.
   罗马人以他们的建筑和工程成就而闻名。