It 's used in castilian spanish .

只有古西班牙语才会那样说。

We speak castilian but we understand english and french .

我们讲卡斯蒂利亚，但我们明白英语和法语。

Castilian is the official language of colombia .

卡司提尔语为哥伦比亚之官方语言。

Of these occitan and catalan are probably the most mutually intelligible although many castilian speakers have little difficulty understanding catalan with the reverse almost invariably true .

这些欧西坦语和加泰罗尼亚语很可能是最相互理解，虽然很多卡斯蒂利亚发言者有什么困难的理解加泰罗尼亚语与逆向几乎总是如此。

It was here that the first literature was produced in castilian , from which one of the most widely spoken languages in the world today is derived .

就是在这里产生了最早使用卡斯提尔语言的文学作品，今天全世界最广泛使用的语言之一--西班牙语，就起源于此。