This system is based on the principle that speed multiple time equals length. With sound-control circuit and a single chip, the equipment can measure, check, display, print etc.

该系统基于速度乘以时间等于距离的原理，运用声控电路和单片机，具有测量、校准、显示、打印等功能。

youdao

The principle of printing on print is introduced.

简要介绍了叠色印花的原理。

youdao

In principle, the US government could print up or borrow a ton of money, hand it to state governments, and then have all the money used to cut taxes rather than to finance programs.

FORBES: Why Borrow Now, Tax Later Is A Bad Idea