Zhè / ge / dì / qū / guò / qù / jīng / jì / luò / hòu / jī / chǔ / shè / shī / yě / hěn / bù / wán / shàn

这个地区过去经济落后，基础设施也很不完善。

This region used to be economically backward, and its infrastructure was also inadequate.