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

GRUB2也能启动这些内核，以及XNU (MacOSX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

Unlike most other Mach-based operating systems, such as GNU HURD (which, contrary to popular belief, does exist), XNU implements UNIX system calls in the same way as a BSD system.

不同于大部分基于Mach的操作系统，比如GNUHURD（与人们以为的恰恰相反，它的确存在），XNU采用与BSD系统相同的方式来实行UNIX系统调用。

youdao

Unlike most other Mach-based operating systems, such as GNU HURD (which, contrary to popular belief, does exist), XNU implements UNIX system calls in the same way as a BSD system.

不同于大部分基于Mach的操作系统，比如GNUHURD（与人们以为的恰恰相反，它的确存在），XNU采用与BSD系统相同的方式来实行UNIX系统调用。

youdao