During the conceptual phase of a building design, major design space decisions that have the greatest influence on buildability of a project are taken.

在构建设计的概念阶段，要做出对一个项目构建产生最大影响的设计空间决策。

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"If we start with the actions next week, which we intend to, to move from a conceptual discussion to implementation phase, we'll start to make commitments that then become very difficult to come out of, " he said.

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