This repository is a Chinese translation of the '500 Lines or Less' book (aosabook/500lines), containing twelve educational chapters each implementing a small, self-contained software system in roughly 500 lines of code. The chapters cover diverse topics including a dynamic build system (Contingent), a flow shop scheduler, optical character recognition, static analysis in Julia, an in-memory graph database (Dagoba), a key-value store (DBDB), a 3D modeller, an archaeology-inspired database, a web crawler with async coroutines, a distributed consensus system, a continuous integration system, and a simple web server. The code is intentionally simplified for teaching purposes and is accompanied by Chinese language articles. The repository is a collection of independent applications rather than a single coherent system, and while the code demonstrates clear patterns and architecture, it is largely educational and not production-ready. Many components rely on outdated language versions (Julia 0.3, Python 2.7, JavaScript ES5) and have minimal error handling, making extraction and reuse challenging without modernisation.