CNTRL: control (non-printing) characters.

cntrl：控制(非打印)字符。

youdao

Cat can also help when you are viewing files that contain non-printing character like tabs. You can reveal them with these options.

cat还可以在您查看包含如制表符这样的非打印字符的文件时起帮助作用。

youdao

You can create a visible grid to aid in page layout using the guidelines feature of your page layout software or by drawing lines or boxes that you place on a non-printing layer of your publication.

你可以创建可见的网格来辅助页面排版：你的页面排版软件有辅助线的功能，或者你可以在非打印层绘制边线或方块。

youdao

Despite the unsettling notion of a technology that lets anyone download a lethal weapon as easily as an pirated episode of Game of Thrones, regulating 3D printing to prevent gun printing would be both counterproductive and ineffective, argues Michael Weinberg, an attorney with the non-profit Public Knowledge who focuses on the legal issues around 3D printing.

FORBES: 'Wiki Weapon Project' Aims To Create A Gun Anyone Can 3D-Print At Home

However, the non-art mainstream publishing industry is not an exemplar of the printing arts.

FORBES: Sandy inspires a good market decision

Many non-Western literatures were stagnant before Western fiction, the modern printing press and the bookstore made significant inroads.

FORBES: Modern Mix