This paper gives a new explanination to the structural formula of plane mechanisms with the help of introducing the rolling pair.

本文引入平面瞬心副（纯滚动副），提出了平面机构结构公式的新含义。

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The application of this new method of analysis of motion will simplify the analysis of motion of the rolling-pair mechanism.

运用这个新的运动分析方法，将会简化滚动付机构的运动分析。

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That hasn't stopped the company from rolling out a pair of impressive home options at CES. The company's CEO Avi Reichental stopped by our stage chat for a while and let us play with the two new devices, the CubeX and the second-generation Cube.

ENGADGET

The pair have started the ball rolling with a census about the club for fans, employees, sponsors, user-groups - and any other interested parties.

BBC: AFC Telford prepare plans for Football League status

The night before, I had fallen onto the floor in my sleep, something that hadn't happened since I'd first graduated from a crib to a bed and to prevent me from rolling out of it my parents had to set a pair of kitchen chairs at the side of the mattress.

NPR: Roth Rewrites History with a 'Plot Against America'