A preliminary estimate or conceptual estimate is based on the conceptual design of the facility at the state when the basic technologies for the design are known.

初步估算或者称为概念方案阶段估价主要基于概念设计方案进行估算，此时只明确了最基本的技术方案。

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Moreover, this is a preliminary estimate and past revisions have sometimes been quite large; barely perceptible growth of 0.1% in late 2009 was subsequently pushed up to 0.5%.

此外，这只是初步估计，有前车之鉴表明初步估计与事实有时相差甚大。2009年末几乎不能感觉到的0.1%增长率最终被推升至0.5%。

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youdao

He added that he expected the preliminary estimate to be revised upwards when more information became available.

BBC: UK economy in double-dip recession

This month the Census Bureau published a preliminary estimate of poverty, using a new definition.

ECONOMIST: The world��s richest country tries to count its poor

This was lower than the preliminary estimate of 0.7%, but still better than the markets had expected.

ECONOMIST: Overview