base没有坐标的意思，是基础、出发点的意思。

例句

1、

Our relationship was based on mutual dependence.

我们的关系建立在相互依存的基础上。

2、

Their reasoning was based on a set of unstated assumptions.

他们的推理是以一系列未说明的假定为基础的。

3、

The movie is based on a real-life incident.

这部电影以现实生活中的一件事为基础。