如果服务器部署在计算机集群中，那么最前端的节点是惟一的关键机器；其他机器可以随意启动和停止，崩溃了也不要紧。

If your servers are pooled in a compute cluster, the head node is the only crucial machine; the rest can start and stop and crash freely.

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早期时，启动一台计算机意味着要给计算机喂一条包含引导程序的纸带，或者手工使用前端面板地址/数据/控制开关来加载引导程序。

In the early days, bootstrapping a computer meant feeding a paper tape containing a boot program or manually loading a boot program using the front panel address/data/control switches.

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前端由客户机计算机（或企业的计算机网络）和用来访问云的应用程序组成。

The front end is composed of a client computer, or the computer network of an enterprise, and the applications used to access the cloud.

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