1 sentence

1. 由于技术落后，这些深层矿床目前很难被开采。

   yóu​yú jì​shù luò​hòu, zhè​xiē shēn​céng kuàng​chuáng mù​qián hěn nán bèi kāi​cǎi.

   Due to outdated technology, these deep mineral deposits are currently difficult to extract.

   Source: Dong Chinese Dictionary