The pré-sal fields are technologically complex and expensive to develop.

盐下石油（pré-sal）油田在技术上相当复杂且开发成本昂贵。

youdao

The pré-sal fields are technologically complex and expensive to develop.

盐下石油（pré-sal）油田在技术上相当复杂且开发成本昂贵。

youdao