铜墙铁壁

jiàn chéng yī dào rén mín zhàn zhēng de tóng qiáng tiě bì

建成一道人民战争的铜墙铁壁

build a bastion of iron during the people's war

wǒ men de zhèng quán shì jiān bù kě pò de tóng qiáng tiě bì

我们的政权是坚不可破的铜墙铁壁。

Our political power is truly an impregnable bastion of iron.

dà bà sì tóng qiáng tiě bì dǐng zhù le hóng shuǐ de chōng jī

大坝似铜墙铁壁，顶住了洪水的冲击。

Like an iron bastion, the dam withstood the rushing floodwaters.