We know a lot about four forces.

我们已经很了解这四种力。

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A chart showing four forces affecting governance.

显示四个影响治理的力量的图表。

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There are four forces which act on an aircraft as it flies through the air.

飞机在空气中飞行时，有四个力作用在它身上。

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Four days later, American Navy forces killed three of the hijackers and rescued the captain,Richard Phillips.

VOA: special.2009.04.25

General Wardak explained that, on election day,the domestic and international forces are preparing "for the worst possible scenario" and will have four-tiers of security in place.

VOA: standard.2009.08.16

General Jacoby says Iraqi security forces are improving every day, and took action in three of the four attacks on Tuesday that prevented them from being worse.

VOA: standard.2009.12.11

Only four forces out of the 44 in England and Wales actually saw crime increase.

BBC: Devon and Cornwall police candidates face crime rise

Judging by challenges at HP, Microsoft and Cisco: each is being challenged by at least one of the four forces.

FORBES: Gartner: More iPads Than Blackberries In Business In 2 Yrs

West Midlands Police is one of four forces who are part of the Home Office project, Communities Against Gun, Gangs and Knives.

BBC: West Midlands knife and gun crime halved in 10 years