The moving characteristics and principles were found through computing. It provided the theory foundation for improving the structure and working principal of the 7NB mud pump.

通过计算找到了7NB泥浆泵的运动规律、运动特点，为进一步改进7NB泥浆泵的结构和工作性能提供了理论依据。

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This paper introduces the design of electro-mechanical shear instrument system, including shear instrument working principal, mechanical structure and control system that use PC and PLC as the core.

本文介绍了剪切仪的机电一体化系统的设计，包括剪切仪的工作原理、机械结构及以PC机和PLC(可编程控制器)为核心的控制系统的设计。

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Workers living outside a principal city and working in a principal city show the highest rates of long commutes, at 12.5%, the report shows.

FORBES: The Cities With The Most Extreme Commutes

After emailing Department of Education officials over the past week, calling 311 and working with the principal of the Brooklyn School of Inquiry, Ms. Gorelik found out Friday that Kevin's newly adjusted score put him in the 97th percentile.

WSJ: Testing Firm Is Under Fire Due to Errors Scoring School Exams

The IETF approval "tells the world that IPP is to be taken seriously, " says Carl-Uno Manros, chair of the IPP working group and a principal engineer with Xerox.

CNN: Technology - Engineers approve standardization of Internet Printing Protocol