This layer differs from PaaS in that the virtual hardware is provided without a software stack.
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。
2
Following is a brief description of the test environment, including information about the hardware and software in each layer of the stack.
以下是测试环境的简要描述，包括堆栈的每个层中的硬件和软件的相关信息。
3
The new website follows the format of Stack Overflow but it has a different community in mind, the hardware guys, the system admins and generally people in an it staff.