Because the federal funds rate is already close to zero, the fed has been buying up bonds with a longer maturity to drive down long-term interest rates.

由于联邦资金利率已经接近于零，因此联储开始买入较长期债券，以降低长期资金利率。

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Indeed, it is the move of established firms on to the Internet that seems likely to drive this technology forward to maturity.

ECONOMIST: When companies connect

The maturity of a social businesses hinges on the ability to develop a competitive advantage through better systems that drive the collective, and not just individual, talent and eminence of the organization.

FORBES: Shifting The Imperative From Knowledge Management To Expertise Management