同意给出一个交货日期区间，而不是一个时间点。 可以随着项目的进展而缩短交货区间。
Agree to use broad estimation ranges rather than single-point estimates and to refine them periodically as the project progresses.
运营商可能需要额外的检查和认证进行，添加额外的时间到交货日期。
Operators may require additional checks and certification to be carried out, adding additional time to the delivery date.
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