Electric circuit elements, electric circuit assembly, electric circuit built-in modules and manufacture thereof.
电路元件，电路元件组件，电路元件内置模块及其制造方法。
Because these are built-in modules, you can use the help interpreter to learn more about them, as demonstrated in Listing 7.
由于这些都是内置模块，因此您可以通过帮助解释器来了解更多相关内容，如清单7所示。
By using this file rather than the built-in modules in CPAN, you get a list of third-party modules installed with your base Perl installation.
通过使用该文件，而不是使用CPAN中的内置模块，可以获取安装基础perl时一起安装的第三方模块的列表。
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