商业周期这个术语用来描写每隔一段时间发生的一般商业活动的扩展和收缩。

The term business cycle is used to describe the ups and downs in general business activity that recur over time.

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这个特性包括从单一位置轻松地部署、扩展、收缩和管理分布式集群的功能。

This feature includes the ability to easily deploy, expand, contract, and manage distributed clusters from a single location.

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关键在于，这些细胞在扩展和收缩的同时也制造出了自己的声音。

Crucially, these cells also create their own sounds as they expand and contract.

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