因此，头文件应该包含函数的原型和一个虚拟的函数定义。
Therefore, the header file should include the prototype of the function and also a dummy function definition.
向虚拟化镜像添加一个虚拟的硬盘定义单元和一个虚拟的以太网连接单元。
Add a virtual disk definition unit and a virtual Ethernet connection unit to the virtual image.
如果你拥有一个虚拟团队，那么网聊、电邮和IP语音(VoIP)便是你不可或缺的工具。
When you've got a virtual team, tools like chat, email and voice over IP are your lifeline.
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