The spatial variability in permeability plays an important role in the coupled hydro-mechanical processes of the fractured rock mass and induces a discontinuous distribution of principal stresses.

渗透系数的空间变异性使得隧道开挖后围岩应力有明显的非连续性，对裂隙介质的耦合过程起着重要作用。

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The principal part of consumption demand is mass consumption. We can promote prosperity of whole consumer market, porvided improving the level of mass consumption.

消费需求的最主要部分是大众消费，只有提高大众消费水平，才能促进整个消费市场的繁荣。

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Calculation methods to determine the mass of polygonal and non-regular form steel plate are introduced and a principal block diagram for oil tank bottom plate mass calculation is listed in this paper.

介绍了多边形钢板与不规则多边形钢板质量的计算方法，列出了用计算机计算油罐底板质量的原理框图。

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The nearly square auditorium for meetings constitutes the principal mass, surmounted by a pitched roof.

WSJ: Prim Grandeur, Elegant Geometries | Charles Bulfinch | Lancaster Meetinghouse | By John Wilmerding

Dintersmith, a principal at Charles River Ventures in Waltham, Mass.

FORBES: Just plain uppity

But beware: If you are going to use your 401(k) for anything other than retirement savings, you have to make sure you are contributing to the account at a level surpassing what you think you need for retirement, notes Brian Keating, principal of Navigator Financial Advisors in Essex, Mass.

FORBES: Back To The Future: Rethinking Retirement