To measure these minor deformations, scientists sent four gyroscopes into space in a mission called Gravity Probe b.

为了测量这种微小的变形，科学家们在引力探测- B计划中向太空发射了四个陀螺仪。

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Probe is made of unique four tuples, as shown below

探测是一个惟一的四元组，如下所示

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In data from NASA's Wilkinson Microwave Anisotropy Probe (WMAP), the program found four regions in the universe that were flagged as promising.

在美宇航局的威尔金森微波各向异性探测器(WMAP)【3】所获得的数据中，这个算法在宇宙中发现有四个地区，它们标记出有着良好的研究前景。

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To measure that, the four gyroscopes in Gravity Probe B are made of fused quartz spheres, which will not expand or contract as the temperature changes.

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The probe was built with four reaction wheels and needs three of them -- one for each axis -- to aim its telescope precisely at a distant star, deputy project manager Charlie Sobeck said.

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