What were the main forces behind its evolvement?

在它演进的背后，主要力量是什么？

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In rich countries four main forces are driving the revival of industrial policy.

在发达国家，四大主要力量正推动着产业政策的复兴。

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From age structure, the main forces of the divorce group aged from22 to 35; the stable period of marriage is between 36 and 50; after 50, divorce rate surges again.

从年龄结构看，22 ~ 35岁人群是离婚主力军，36 ~ 50岁年龄段是婚姻平稳期，50岁以上人群离婚率上扬。

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By eighteen-sixty-two, the trail was the main supply line for Union forces in the Southwest.

VOA: special.2009.03.30

The seaport is one of three main sites in Mogadishu protected by the AMISOM forces.

VOA: standard.2009.09.26

For much of the 20th century, science and democracy have been the main forces shaping the university.

ECONOMIST: The knowledge factory

This allows the organization to better focus on the main forces that are shaping the environment around it.

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That said, the main forces driving trading are already in the market.

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