2 sentences for 第一线 (dì​yī​xiàn — frontline)

1. 敌人的进攻在第一线受挫。

   dí​rén de jìn​gōng zài dì​yī​xiàn shòu​cuò.

   The enemy's attack was thwarted at the front line.

   Source: Dong Chinese Dictionary

2. 将士们在战斗的第一线英勇奋战。

   jiàng​shì men zài zhàn​dòu de dì​yī​xiàn yīng​yǒng fèn​zhàn.

   The soldiers fought bravely on the front lines of the battle.

   Source: Dong Chinese Dictionary