This couple come to understand that stress has kept them from exercising and taking care of themselves.

这对夫妻逐渐认识到，压力使他们不能锻炼和照顾自己。

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Couple stress fluids are the fluids consisting of rigid, randomly oriented particles suspended in a viscous medium, which have been widely used in scientific, industrial and clinical fields.

应力偶流体是一种粘性介质，其中悬浮着刚性的、随机排列的粒子，在科学和工程技术、医疗临床中具有广泛的应用背景和现实意义。

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The results show that the couple stress fluid flow behavior depends on not only the coefficient of viscosity, but also the material constant responsible for the couple stress parameter.

所得结果表明应力偶流体运动特性不仅依赖于物质粘性常数，而且强烈地依赖于应力偶流体特有的与固体颗粒尺度有关的物性常数。

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For starters, the couple could have used stress-tested PGP (Pretty Good Privacy) for point-to-point encrypted email which involves installing a separate piece of client software and the exchanging of public keys.

FORBES: The General, The Biographer, And Unencrypted Email