1. My computer froze, so I had to press Alt + Ctrl + Delete to restart it.
我的电脑死机了，所以我不得不按下Alt + Ctrl + Delete来重新启动它。

2. You can change the font size by holding down the Alt key and scrolling with your mouse wheel.
你可以通过按住Alt键并用鼠标滚轮滚动来更改字体大小。

3. To switch between tabs in your internet browser, you can press Alt + Tab.
要在互联网浏览器中切换标签，你可以按Alt + Tab。

4. The shortcut for saving a document is Alt + S.
保存文档的快捷键是Alt + S。

5. If you want to access the menu bar in the program, just press the Alt key.
如果你想要访问程序中的菜单栏，只需按下Alt键。

6. Press Alt + F4 to close the current window.
按下Alt + F4关闭当前窗口。