They have no virtual memory support, don't have direct access to the computer's RAM, and have extremely limited interrupt support.

它们没有虚拟内存的支持，不能直接访问计算机的RAM，中断支持也非常有限。

youdao

All UNIX operating systems support a system of virtual memory (VM).

所有unix操作系统都支持某种虚拟内存(VM)系统。

youdao

Windows 3.0 introduced a host of new features: Program Manager, Solitaire, support for VGA and virtual memory, and a new "3d" look.

Windows 3.0引入大量新功能：程序管理器，纸牌小游戏，支持VGA和虚拟内存，以及一个更有立体感的外观。

youdao

Flash memory offers fast ways to cache and serve up digital content to support high usage virtual machine environments.

FORBES: VM World is a Flashy Place