By designing or customizing an application to support elasticity, you imply that you've also implemented parallelism, statelessness, and transaction support in your application.
设计或定制一个应用程序来支持灵活性，意味着您还需要在应用程序中实现并行性、无状态性和事务支持。
Cloud application security impacts certain characteristics strongly: Multi-tenancy, parallelism, and loose coupling introduce additional security needs.
云应用程序安全性会对特定的特征产生重大影响：多租户、并行性和松耦合性都会增加安全性需求。
Concurrency is about parallelism, but inside the application.
并发也就是平行，只不过是在程序内部进行的。
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