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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By comparison of test results of two prototypes, it is shown that the capacitor three phase induction generator is worth being popularized in winding power system.

通过两台样机进行实验对比，实验数据表明三相电容式异步发电机在风电系统中有很高的应用推广价值。

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Beijing Institute of Aeronautics (BIA) used parts recovered from the Firebee wreckages to assemble two prototypes for flight tests in 1972 and these flew successfully.

1972年北京航空学院(BIA)使用从坠毁“火蜂”回收的部件组装了两架原型用于飞行测试并成功飞行。

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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