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We live in a period of revolution that is rapidly moving toward a return to a monarchy.

This is because, in co-orbital motion, the planet and secondary body orbit in the same region with the same period of revolution.

It was a period of revolution but the frontline was far from Billings.

In the early years of the 20th Century, the arts entered a period of revolution.

After listening to Alibaba executive Liu Chunning describe Yule Bao during one panel discussion at the festival this week, Ren Zhonglun, the venerable head of the 65-year-old Shanghai Film Group, declared his industry to be “in a period of revolution.”