2 sentences

1. 红军在这一带建立了根据地。

   Hóng​jūn zài zhè yī​dài jiàn​lì le gēn​jù​dì.

   The Red Army established a revolutionary base in this area.

   Source: Dong Chinese Dictionary

2. 抗日战争期间，八路军在华北建立了许多根据地。

   Kàng Rì Zhàn​zhēng qī​jiān, Bā​lù​jūn zài Huá​běi jiàn​lì le xǔ​duō gēn​jù​dì.

   During the War of Resistance against Japanese Aggression, the Eighth Route Army established many base areas in North China.

   Source: Dong Chinese Dictionary