The bash shell contains two types of commands: builtins, which are internal, and external programs (or external filters and commands), which are typically self-contained binary program files.
bash shell包含两类命令：内部的内置命令和外部程序(或外部筛选器和命令，它们通常是自含的二进制程序文件)。
The internal dynamic elements are auto-regressive moving average filters with local activation feedback and local output feedback, respectively.
其中内部动态元分别由带有局部激活反馈和局部输出反馈的自回归滑动平均滤波器构成。
Road vehicles and internal combustion engines. Filter vocabulary. Definitions of filters and filter components.
道路车辆和内燃发动机。滤清器词汇。滤清器和滤清器元件定义。
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