The Inca had no written language but they were able to keep records with knotted strings called quipus.

印人没有书面语言，但他能够称为 quipus 的打结绳来保存记录。

Although the Inca had no writing, they used a complex system of knotted strings called quipu to record numbers and perhaps other information.

虽然印人没有文字，但他“奇普”，这是一种复杂的结绳记事系统，来记录数字和其他信息。

And some states, like the Inca empire, did without writing (though the Incas developed an extraordinary system of knots called quipu, still only partly understood).

一些国家，如印帝国，没有文字（尽管印人开发了一种称为 quipu 的非凡结系统， 但仍然只被部分理解）。