Ironically, it was the very use of a crash-free model that helped to trigger a crash.

具有讽刺意味的是，正是这一无视危机存在的模型，催生了一场危机。

youdao

But, after two-and-a-half years of providing it without charge, we realized that we could not make the free model work.

但是，在这两年半不收费的时间里，我们意识到我们无法让这种免费的模式运作下去。

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The establishment of complex network model of these systems, such as small world model and scale-free model, has been a hotspot in recent years.

建立这些系统的复杂网络模型，比如小世界模型和无尺度模型，是近年来研究的热点。

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A small community of design firms and regulators in North Carolina is currently testing the model, and after this trial period, it will be available free to the public on Bill Hunt's university faculty webpage.

VOA: standard.2010.08.04

How do we make the for-free model?

我们怎么才能做好免费网站？

麻省理工公开课 - 媒体、教育、市场课程节选

The company later ran into trouble with its free model and switched to a paid-only model.

FORBES: Glam Media Acquires Ning In Ad-Social Publishing Tie-Up; Andreessen Joins Glam Board

Initially offered for 99 cents per issue, it quickly switched to a free model after failing to sell many subscriptions.

FORBES: Prestige Hire Tim O'Brien Departing Huffington Post

He said that the politics-free model provided by the feast-day celebrations of Downpatrick would act as the basis for their event.

BBC: News | Northern Ireland | Rivals plan separate St Patrick's Day parades