These firms are regarded as the engine room of the economy.

这些公司据信对经济有重大影响力。

《柯林斯英汉双解大词典》

That's the way these firms work.

这就是这些律所工作的方式。

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The reach of these firms is vast.

这些公司的涉及范围很广。

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And these firms have taken these risks while benefiting from special financial privileges that are reserved only for banks,".

VOA: standard.2010.01.21

Now to make that lower-of-the-two-prices comment a little bit more rigorous, let's figure out what the demand actually is for these firms.

为了说明两者价格较低者,具体是什么意思,先来解决这些公司真正的需求量是什么

耶鲁公开课 - 博弈论课程节选

Each of these firms is trying to maximize profits, but how about the total profit in the industry?

每一家公司都尽力实现利润最大化,可整个行业总利润是怎样计算的呢

耶鲁公开课 - 博弈论课程节选

That because these firms have already returned what they borrowed directly, their obligation is fulfilled.

WHITEHOUSE: Weekly Address: Getting Our Money Back from Wall Street

Consulting to pensions was the least profitable, most labor intensive, service these firms offered.

FORBES: SEC Scrutiny of Pension Consultants: A Call To Action (February 28, 2004 )

Some of these firms audited only one broker-dealer, while others audited over 150 broker-dealers.

FORBES: All Talk: The SEC's Broken Broker-Dealer, Investment Advisor Examination Program