GRUB 2 can directly boot all these same kernels plus XNU (the Mac OS X and Darwin kernel).

GRUB 2也能启动这些内核，以及XNU (Mac OS X和Darwin内核)。

youdao

Part of the responsibility of the BSD layer in the XNU kernel is making this rough mapping concrete.

在XNU内核中，BS D层的一部分责任就是将这些进行粗略的实体映射。

youdao

In fact, Darwin is closer to being an analog of a member of the BSD family; it's a complete system including a kernel, XNU, and a set of userland applications.

事实上，Darwin更加近似于BSD家族成员中的一员；它是一个完整的系统，包括一个XNU内核，以及一套外围程序(userland)。

youdao