2 sentences

1. 连日的大雨导致地基陷落。

   lián​rì de dà​yǔ dǎo​zhì dì​jī xiàn​luò.

   Days of heavy rain caused the foundation to cave in.

   Source: Dong Chinese Dictionary

2. 由于援军未到，这座城市最终陷落了。

   yóu​yú yuán​jūn wèi dào, zhè zuò chéng​shì zuì​zhōng xiàn​luò le.

   The city finally fell because reinforcements did not arrive.

   Source: Dong Chinese Dictionary