What is this thing where we take one word and we reduplicate it?

为什么我们要把一个词重复一遍？

Words like this are reduplicated forms, and new ones are really rather unusual.

像这样的一类词被称为叠词，叠词出现是极其罕见的。

There's a class of very unusual words in English, they're called " reduplications" or " reduplicated forms" : " bow wow, says the dog" .

英语当中有一类特殊的词，它们被称之为“叠词”，比如：bowwow (汪汪)——狗叫的声音。