以下为句子列表：
英文: For the contractor ，a bid estimate submitted to the owner either for competitive bidding or negotiation consists of direct construction cost including field supervision ，plus a markup to cover general overhead and profits.
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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