三峡工程二期上下游横向围堰与混凝土纵向围堰共同形成基坑，保证二期工程施工。
The second stage foundation pit of the TGP will be bounded by the upstream and downstream transverse cofferdams and the longitudinal concrete cofferdam.
三峡工程二期上、下游横向围堰与混凝上纵向围堰共同形成二期基坑，测绘工作要求很高。
The second stage construction area on the main river bed is formed by the second stage up & downstream transverse cofferdams and the longitudinal con crete cofferdam.
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