There are about fifteen hundred languages in the world.翻译中文

全世界大约有一千五百种语言。

languages 语言（复数）
lauguage 语言（单数）

fifteen hundred 十五个一百 = 一千五百

世界上有大约1500种语言。

about大约

fifteen hundred 15百，也就是1500

全世界大约有一千五百种语言
这个fifteen hundred languages就是十五个百种语言也就是1500种语言。
那个hundred前面有准确数字(1.2.3.4...)的时候后面是不需要加S的，但是language是个可数名词，所以后面要加S，就是这样。

世界上有1500种语言。

世界上大约有1500种语言。

十五百，就是1500了

There are about fifteen hundred languages in the world.
But only a few of them are very important. English is one of these. Many, many people use it, not only in England and the U. S. A, but in other parts of the world. About 200, 000, 000 speak it as their own language. It is difficult to say how many people are learning it as a foreign language. Many millions are trying to do so.
Is it easy or difficult to learn English? Different people may have different answers. Have you ever notice the ads of this kind in the newspapers or magazines?
“Learn English in six month, or