The team branch is red to highlight that it is less stable, i.e. the stuff on that branch passes the unit tests but it might not be integration tested and might not be stable enough for release.
团队分支是红色的，表示它不太稳定；例如：这个分支通过了单元测试，但是它可能还没有完成集成测试，所以还没有稳定到可以发布的状态。
To limit the possible damage done by changes, unit tests and integration tests are mandatory, otherwise the entire functionality of the system needs to be hand-tested after each change.
为了限制变更可能造成的破坏，单元测试和集成测试是必须的，否则就要在每次变更后手动测试整个系统的功能。
In these cases, either the unit test or the code to be tested is most likely incorrect.
如果是这样，不是单元测试有问题，就是被测试的代码不正确。
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