The core OS, core services, media layer, and Cocoa — to build the iPhone OS we took the bottom three layers to form the iPhone OS.
核心OS、核心服务、多媒体层以及Cocoa。
Route subsystem as a core module in OS of 3-layer-switch has new requirements in efficiency, stability and scalability.
路由子系统做为三层交换机系统软件的核心模块，在效率、稳定性与可扩展性上有了新的要求。
Route subsystem as a core module in OS of 3-layer-switch has new requirements in efficiency, stability and scalability.
路由子系统做为三层交换机系统软件的核心模块，在效率、稳定性与可扩展性上有了新的要求。
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