每个客户都知道栈，所以软件和硬件最佳实践提供了一些实现选项。
Because the stack is known for each consumer, software and hardware best practices provide options for implementation.
硬件栈和具体的手机芯片,都不重要。
The hardware stack and particular chips in the phone didn't really matter.
这一层与PaaS的不同之处在于，只提供虚拟硬件，而没有软件栈。
This layer differs from PaaS in that the virtual hardware is provided without a software stack.
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