That can really add up if you want to host a movie night or a 3-d Olympics party with a large group.

如果你想要和一大群人举办一个电影之夜或者3d奥林匹克派对，那真的会大幅增加成本。

youdao

The Romans had to keep on cooking up new letters every time their numbers got bigger - C for 100, D for 500, M for 1, 000 - because they didn't have zeros to add on to the end.

当数字增大时，罗马人只能疲于接招，不断地创造出新的字母用来标记数字 ——C代表100，D代表500，M代表1000 ——因为在他们的数字系统中不能将‘0’添加在数字后面。想感觉100万有多大？

youdao

The Romans had to keep on cooking up new letters every time their numbers got bigger - C for 100, D for 500, M for 1, 000 - because they didn't have zeros to add on to the end.

当数字增大时，罗马人只能疲于接招，不断地创造出新的字母用来标记数字 ——C代表100，D代表500，M代表1000 ——因为在他们的数字系统中不能将‘0’添加在数字后面。想感觉100万有多大？

youdao