找不到操作系统；系统引导文件丢失；操作系统文件丢失

disk operating system───[计]磁盘操作系统

disk operating systems───磁盘操作系统

operating system───[计]操作系统

operating systems───操作系统；作业系统

mining operations───采矿作业

mitigation system───缓解系统

antilock braking system───防抱制动系统

One feature that seems missing from the Web operating system collective tool set is the notion of a Web-based clipboard.───Web操作系统工具集中似乎缺少了一个特性，即基于Web的剪贴板的概念。

Besides some general updates to the Android operating system, this new will also allow for video recording - a feature that is still missing from Apple's iPhone.───除了一些基本的操作系统升级外，新手机有录像功能-这个苹果IPHONE目前不具备的。

The change made Linux fully compatible with the rest of GNU's software, and the GNU project began integrating the kernel - the project's biggest missing link - into its free operating system.───这一改变使Linux完全与其余的GNU软件兼容，而GNU项目开始把内核——该项目缺少的最大环节——并入其自由的操作系统。

In the first go I ended up with a "Missing operating system" error when trying to boot from it.───首先，我去了一个“遗失的作业系统”的错误时，试图启动它。