In an undated picture, a mock-up of the A-12 spy plane sits perched upside down on a testing pylon at Area 51-part of radar tests to reveal revealed how visible, or invisible, the design was to radar.

在一张未标明日期的图片中，一架实物模型的A - 12间谍飞机倒挂着停放在51区的一个测试塔上，这是为了测试该飞机的外观在雷达上可视或不可视的程度。

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Prototyping is a more hands-on type of modeling that can involve a mock-up, test-of-principle, or actual working version of a specific area of the design.

原型是一种非常有帮助的建模类型，它可以用于模拟，原理测试，或者设计的特定方面的实际工作。

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In this Photoshop web design tutorial, we're going to create a mock-up of a clean and modern-looking website.

这个Photoshop web设计的教程中，我们将学习设计一个整洁的具有现代气息的web站点。

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While the technology is still in the very early stages, 3D printing is nearing becoming a real world application. 3D printing is a tool that can be used to validate a design, ensure pieces fit together properly and even make a product mock-up for marketing.

FORBES: 3D Printing Doesn't Live Up To The Hype Yet