在主机内部直接与CPU交换信息的存储器成为内存或主存。

In the mainframe, memory that directly transit information with CPU is referred to as internal memory or primary storage.

youdao

这样就产生了主机内核（硬件上的内核）和客户内核（在主机内核的用户空间中运行）。

This results in what's called the host kernel (which resides on the hardware) and the guest kernel (which runs in the user space of the host kernel).

youdao

这些内核甚至可以是嵌套的，这样就允许一个客户内核在另外一个运行于主机内核的客户内核上运行。

These kernels can even be nested, allowing a guest kernel to run on another guest kernel that is running on the host kernel.

youdao