由于冗余是ha集群的关键特性，因而在这个例子中基本的组成部分包括节点管理、分布式文件系统、卷管理和监控。
With redundancy being the key feature of an ha cluster, the components that are essential in this example are node management, a distributed file system, volume management, and monitoring.
主动力单元（PPU）是一种可搭载空中和公路运输，拖车式1.3MW （兆瓦）发电机组，这也是终端高空防御系统（THAAD）的关键组成部分。
The Prime Power Unit (PPU) is an air- and highway-transportable, trailer-mounted 1.3MW (megawatt) Generator Set, a key component of the Terminal High Altitude Air Defense (THAAD) system.
AESA的开放式系统架构合并了商业现货的组成部分，更具经济可承受性，每隔10年到20年才需进行维护。
AESA's open systems architecture incorporates commercial off-the-shelf components and is anticipated to be more affordable and require maintenance only every 10 to 20 years.
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