以下为句子列表：
英文: The required levels of construction cost estimates vary at different stages of project development ，ranging from ball park figures in the early stage to fairly reliable figures for budget control prior to construction.
中文: ?建筑成本估算要求的精确程度在项目发展的不同阶段发生着变化，从早期的相近数字到施工前预算控制时相当准确的是数字。
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