第二个原则是渐进原则(progression principle)，渐进原则指出人的五种需求是以台阶的方式来排列的，他必须满足低层的需求，上一阶层的需求才能成为工作的动机。
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In this paper, the characteristics and influencing factors of blasting vibration in rock and recent research progression were expounded on the basis of modern blasting principle.
文章从现代爆破作用原理出发，阐明岩体爆破的震动特性、影响因素及最新研究进展。
The resolution of each pixel can be computed according to the principle of geometrical progression. The geographical position of the pixel, in turn, can be determined.
可以利用等比级数的原理计算象素分辨率，从而确定象素的地理位置。
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