After you have selected optional dependencies, you should see a window similar to the one pictured on the left. This lists all the packages that will be installed, upgraded or removed by the action. Once you have reviewed the list, press the Apply button to install the packages.
选择可选依赖项之后，你应当看到如左图所示的窗口。其中分别列出了将要进行安装、升级或移除等动作的所有软件包。在检查列表后，按下“应用”按钮以安装软件包。