无坚不摧的城墙百毒不侵的心脏
[wú jiān bù cuī de chéng qiáng băi dú bù qīn de xīn zàng]
This translates to 'An impregnable city wall, an invincible heart,' representing strength, resilience, and emotional fortitude. It suggests someone who is tough and unbreakable both physically and emotionally.