In order to provide a criteria for the stage division, the author gives a definition of exploration stage, division principles and its quantitive indications.

为了使划分阶段具有准则依据，作者提出了地勘阶段的定义、划分原则和区分阶段的定量标志。

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Considering the present situation of shield tunneling on Beijing metro, the paper describes the construction stage division and the main points of engineering quality control for shield tunneling.

结合北京市地铁隧道盾构法施工的现状，对施工阶段的划分及各阶段的质量管理与控制要点进行阐述。

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Stage division and its content.

阶段划分及其内容。

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At that stage we can merge these, and then take this down, do the division merge and bring them back up.

在那里做一次分解，做到这步时，我们可以把这些进行合并，然后把这个拿下来,做分解合并过程后再把它们拿回去。

麻省理工公开课 - 计算机科学及编程导论课程节选

There's one division, here it shows it at the 16 cell stage and then here, and this transformation as it goes from 16 cells to more like 64 cells.

这是第一次分裂,这里显示的是十六细胞期,然后在这里,在这里胚胎进一步的产生了变化,由十六个细胞分裂为约六十四个

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