The paper also constructs and implements the new four-module practice teaching system.

构建并实施“四模块”实践教学新体系；

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At completion, your module directory should now have (at least) four files, like so.

在结束时，您的模块目录应该(至少)有以下4个文件。

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To replace a module, simply remove four screws and replace with a new module.

要替换的模块，只需删除四个螺丝，代之以一个新的模块。

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To replace a module, simply remove four screws and replace with a new module.

要替换的模块，只需删除四个螺丝，代之以一个新的模块。

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