设计这种交换机很有挑战性，需要考虑几个因素：高可靠性、无停机时间(热代码升级)、大规模并发性。
The design considerations for switches like these are challenging: extreme reliability, no downtime (hot code upgrades), and massive concurrency.
上有灰尘的笔记本电脑CPU的散热器经过三年的使用，使笔记本电脑由于经常使用的热停机。
The dust on the laptop CPU heat sink after three years of use has made the laptop unusable due to frequent thermal shutdowns.
快照技术是产生在线热备份的重要技术手段，存储子系统中使用快照技术能够有效地缩短复制操作造成的停机时间。
Snapshot is a major technology for online hot backup, it can effectively reduce the down-time needed to perform conventional copy operations in the storage subsystem.
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