A balanced three-layer sample rotation pattern is presented in this paper to solve the problem of rotation for the quarterly surveys with three-stage sampling designs.

本文构造了一种平衡的三层次样本轮换模式，解决了三阶段抽样季度调查的三层次样本轮换问题。

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But the discovery that the area surrounding the tachocline varies its rotation in a regular pattern could be a clue to solving the mystery.

BBC: Sun has strange 'spin cycle'

Between 1980 and 2000 the pattern was a gentle rotation of peaking at 22 weeks and then declining as economic fortunes improved to 12 weeks.

FORBES: Labor Pains

So far, the two trends have produced an encouraging trading pattern on Wall Street: Sector rotation.

FORBES: Wall Street: The Beginning or the End of a Correction?