In this paper the two products are introduced firstly, and taking virtual training system of certain weapon system as background, a design project is offered.

在本文中，对以上两种产品进行了介绍，并以武器装备虚拟操作训练系统为背景，提供了一种设计方案。

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In this paper, the two products are introduced firstly, and taking virtual training system of certain weapon system as background, a design project is offered.

在本文中，对以上两种产品进行了介绍，并以开发某型武器系统虚拟操作训练系统为背景，提供了一种设计方案。

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Take the research and development of integrated bridge system as background; this paper studies the development of the autopilot in the integrated bridge system.

本文以综合船桥系统的开发为背景，研究了综合船桥系统下自动舵系统的开发问题。

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He believes that something like legislation that expands and improves our background check system as the amendment that Senators Toomey and Manchin have put forward should garner the support in the Senate that it has in the country.

WHITEHOUSE: Press Briefing

New York state took steps Tuesday to bolster its background-check system as part of firearm-restrictions legislation that Democratic Gov. Andrew Cuomo signed into law.

WSJ: Systemic Gaps Hinder Background Checks for Gun Purchases

Gun-control advocates have helped highlight these flaws, but some also worry that focus on the system's holes will be used as an excuse to block legislation requiring universal use of the background check system.

WSJ: Systemic Gaps Hinder Background Checks for Gun Purchases