6 sentences

1. 你是最后一道防线。

   nǐ shì zuì​hòu yī dào fáng​xiàn.

   You're the last line of defense.

   Source: OpenSubtitles

2. 士兵们成功守住了最后的防线。

   shì​bīng men chéng​gōng shǒu​zhu le zuì​hòu de fáng​xiàn.

   The soldiers successfully held the last line of defense.

   Source: Dong Chinese Dictionary

3. 士兵们受命一定要守住这道防线。

   shì​bīng men shòu​mìng yī​dìng yào shǒu zhù zhè dào fáng​xiàn.

   The soldiers were ordered to hold this defensive line at all costs.

   Source: Dong Chinese Dictionary

4. 突击队在敌军防线上打开了一个突破口。

   tū​jī​duì zài dí​jūn fáng​xiàn shàng dǎ​kāi le yī gè tū​pò​kǒu.

   The assault team opened a breach in the enemy's line of defense.

   Source: Dong Chinese Dictionary

5. 大军以精锐骑兵为锋，迅速突破了敌人的防线。

   dà​jūn yǐ jīng​ruì qí​bīng wéi fēng, xùn​sù tū​pò le dí​rén de fáng​xiàn.

   The army used elite cavalry as the spearhead and quickly broke through the enemy's defense line.

   Source: Dong Chinese Dictionary

6. 为了冲破敌人的防线，指挥官组建了一支敢死队。

   wèi​le chōng​pò dí​rén de fáng​xiàn, zhǐ​huī​guān zǔ​jiàn le yī zhī gǎn​sǐ​duì.

   To break through the enemy's lines, the commander formed a suicide squad.

   Source: Dong Chinese Dictionary