In some cases, it is perfectly acceptable to assume a flat model of the Earth and lose some accuracy in exchange for speed.

在一些情况下，完全可以采用平面地球模型，通过牺牲一些精确性来获取速度。

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Experimental results show that three of the hierarchical models outperform the traditional "flat" model in terms of tree loss values.

试验结果表明三种层次化模型在树损失的评价指标下比传统的“平面”模型有提高。

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But it is attacking with a radical business model: inexpensive flat-rate wireless data for any device (it plans to add voice service soon).

ECONOMIST: Face value

To get a valid Stimp reading with the old model requires a relatively flat run of putting surface 12 to 14 feet long.

WSJ: Ta-Da! The USGA Gives the Stimpmeter a Makeover | Golf Journal by John Paul Newport

But full-year flat monetization blows up the P model.

FORBES: Pandora Slides; Street Sees Mobile Monetization Troubles