This paper makes a comparison test between the two prototypes.

本文对两个样机进行了对比测试。

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An additional two prototypes using Chinese-made parts made their first flight successfully in 1976.

另外两架原型使用中国制造的部件在1976年成功进行了首次飞行。

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Hennessey is planning to build two prototypes within 2009 in order to evaluate the public's reaction.

亨尼西正计划兴建两个原型在2009年，以评估市民的反应。

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Here you have to use your imagination, because the two prototypes shown were pretty rough.

WSJ: VL Destino: The Detroit Show, and the Only Car That Matters | Rumble Seat by Dan Neil

Put another way, an offer letter in hand is worth two prototypes and a Google Apps slide deck in the bush.

FORBES: Does It Pay to Become an Entrepreneur?

Designed by Herefordshire-based Hugo Spowers, just two prototypes of the car currently exist, one of which is at the London Science Museum.

BBC: Hugo Spowers with hydrogen-powered car