内核地址空间中的第一页虚拟内存可通过内核代码访问，但是被标记为只读。
The first page of virtual memory in the kernel address space can be accessed by kernel code, but is marked as read-only.
这已经不是第一次讨论虚拟货币作为未来的在线支付方式。
It's not the first time that virtual currencies have been mooted as the future of online payments.
网络是虚拟化的一个关键方面，代表虚拟化设置中第一等的元素。
The network is a key aspect of virtualization and represents a first-class element of the virtualization set.
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