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1·Map this number to the Roman numeral system.

将这个数字映射到罗马数字系统。

2·For instance, take a number from the Arabic numeral system, such as 9.

例如，从阿拉伯数字系统中取出一个数字，比如说 9。

3·Now map that back to the Arabic numeral system and you end up with, no surprise, 9.

现在把它映射回阿拉伯数字系统，毫无疑问，你会得到9。

4·In short, for each Arabic numeral, there is one, and only one, Roman numeral which maps to it.

简而言之，每个阿拉伯数字对应一个罗马数字，而且只有一个罗马数字映射到它。

5·The other side features the famous ancient Greek marble statue of a discus-thrower, Discobolus, portraits of athletes and the Arabic numeral 2008.

另一侧是著名的古希腊大理石掷铁饼者雕像、运动员肖像和阿拉伯数字“2008”。

6·There is no mapping of Arabic 0 to a Roman numeral.

因为根本就不存在从阿拉伯的0到罗马数字的映射。

7·A handwritten numeral recognition, it is true!

一款手写数字识别系统，不错哦！

8·Change the character references 2 to the actual numeral 2.

将字符引用2改为实际的数字2。

9·The Arabic numeral zero cannot map to the Roman numeral system.

阿拉伯数字0不能映射到罗马数字系统。

10·A table comparing numerals in two different numeral systems.

一种可以比较两种不同数制中的数字的表格。