然而，由于正则表达式必需能够匹配全部由空格组成的字符串，整个捕获组通过尾随一个？量词而成为可选组。
However, since the regex must be able to match whitespace-only strings, the entire capturing group is made optional by adding a trailing question mark quantifier.
我们用几个LVM命令捕获当前的磁盘和卷组配置。
We capture the current disk and volume group configuration with several LVM commands.
选择以上图标右边的图标以捕获一个菜单或一组层叠菜单。
Select the icon to the right of the previous icon to capture a single menu or a set of cascading menus.
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