mujoco: A Chinese Translation of the MuJoCo README, and What It Actually Saves You
MuJoCo stands for Multi-Joint dynamics with Contact. The original repository, google-deepmind/mujoco, has 16836 stars, is written in C++, and ships under Apache-2.0. A Chinese translation of its README was published on 2026-11-10 at https://github.com/yangshun2005/mujoco-cn. That translated repo has zero stars as of writing, so treat it as a fresh document, not a community institution.
The question worth answering is narrow: what does a translated README change for someone trying to get a physics engine running? Not the engine. Not the API. The reading path.
What the translated repository contains
Two layers, and the README is explicit about the split.
The first layer is a 中文快速上手 section — a supplemental guide written for Chinese-speaking users, marked as not part of the original text. Its stated purpose is to let you run the project before reading the full README.
The second layer is the translated body of the original README, described as faithful to the source. The original English text is kept alongside as README_en.md, so you can diff them.
That structure matters more than it looks. A translation that silently rewrites the original is hard to trust. Keeping README_en.md in the repo means a reader who suspects a mistranslation has somewhere to check.
The install path, in four steps
The quick-start section reduces onboarding to four moves. None of them are new information — they are the original README's Getting Started, reordered for someone who wants a running binary in ten minutes.
- Browser first, no install. Open mujoco.org or live.mujoco.org. The second is the WebAssembly build of MuJoCo Studio, where you can view and drag-drop your own models. The README states plainly that this is slower than native C.
- Run a viewer locally. Download a prebuilt release per the Getting Started guide and launch MuJoCo Studio or the classic
simulateviewer. The translated README notes that the original does not provide specific download or launch commands and points back to the README body. - Python users install the bindings. Python >= 3.11 is required:
pip install mujoco The bindings bundle a copy of MuJoCo, so there is no separate engine install.
- Work through the tutorials. The entry notebook is
python/tutorial.ipynb, runnable on Google Colab. Others cover model editing, rollout, LQR, least squares, MJX, and differentiable physics.
Step 3 is where most people actually start, and it is one line. The friction was never the command — it was knowing that the bindings ship the engine, that Python 3.11 is a hard floor, and that a source build is a separate and riskier path.
Platform constraints the translation surfaces early
These are all in the original README, but the quick-start pulls them forward into a short list:
- Prebuilt binaries cover Linux (x86-64 and AArch64), Windows (x86-64 only), and macOS (universal).
- Python bindings require Python >= 3.11.
- Building from source needs CMake, minimum version 3.16 per
CMakeLists.txt. - Prebuilt Linux wheels target
manylinux2014; some distributions will not be compatible. - The
mainbranch's latest commit may be unstable — prebuilt releases are the recommended path. - Releases are targeted for the first week of each month, and from 3.5.0 onward the project uses a modified semantic versioning scheme. Version numbers before and after that point do not follow the same rules.
The Windows x86-64-only note is the kind of detail that costs an afternoon if you discover it after downloading. Putting it in a bullet list near the top is a real improvement over burying it in a build matrix.
The pip mirror note, and why it belongs there
The quick-start adds one line that has no counterpart in the original: pip install mujoco pulls from PyPI, and users on mainland Chinese networks may need to switch to a mirror for speed.
That is the clearest example of what a localization layer can do that a translation cannot. It is not translation. It is operational knowledge about the network path between a user and the package index, and it is invisible to anyone writing docs from inside a well-connected network.
I have not measured how much time that saves, and the repository does not claim a number. My sample is one reading of the README, not a user study.
Where the translation stops being useful
The quick-start is a supplement, and the README says so. Everything past it is the original documentation rendered in Chinese. That means:
- The API reference, XML schema documentation, and the full docs site at [mujoco.readthedocs.io] remain English-first. The translated repo does not touch them.
- Error messages, stack traces, and the C API headers are English. Reading translated prose does not prepare you for
mj_stepreturning something unexpected. - The Colab notebooks are English. Tutorial prose in
python/tutorial.ipynbis not translated by this repository.
So the realistic benefit is bounded: it lowers the cost of the first hour, not the cost of the first month. Anyone doing serious work in MuJoCo will end up in the English docs regardless. That is not a criticism of the translation — it is a statement about scope.
The maintenance question
The README ends with an invitation: report inaccurate translations via Issue or PR. That is the right posture, and it also names the risk. A translated README is a snapshot. The original project releases monthly, and from 3.5.0 the versioning scheme changed. Each upstream release is a chance for the translation to drift.
The README_en.md file is the mitigation. As long as it is updated in step with the translation, a reader can verify any claim against the source. If it lags, the translation becomes a document of unknown vintage.
There is no stated sync policy in the README. That is worth knowing before you rely on it for anything version-sensitive.
Who this is for
If you are a Chinese-speaking developer who has heard of MuJoCo, wants to know whether it runs on your machine, and wants a working import mujoco before deciding whether to invest further — the quick-start section is aimed directly at you. Four steps, one command, a list of platform gotchas.
If you already use MuJoCo, the translated README will not teach you anything the English one did not. The one exception is the pip mirror note, which is genuinely additive.
The repository is at https://github.com/yangshun2005/mujoco-cn. The original is at https://github.com/google-deepmind/mujoco, 16836 stars, C++, Apache-2.0.
Chinese documentation: https://github.com/yangshun2005/mujoco-cn
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