2 sentences

1. 古代村民常筑坞以抵御外敌。

   gǔ​dài cūn​mín cháng zhù wù yǐ dǐ​yù wài​dí.

   In ancient times, villagers often built stockades to defend against foreign enemies.

   Source: Dong Chinese Dictionary

2. 这座山脉是阻挡外敌的天然藩屏。

   zhè zuò shān​mài shì zǔ​dǎng wài​dí de tiān​rán fān píng.

   This mountain range is a natural barrier against external enemies.

   Source: Dong Chinese Dictionary