Including the limited space to do construction, and the depth of the hole in the pipe. The period of construction of the pipeline is laid, it may not be finished.
Including the limit of the area to be constructed. And the depth of the hole in the pipeline. As a result, the period of construction of the pipeline. May not be completed on schedule.
The limitation of space to the construction. And the depth of the holes in the pipeline. The construction period: the pipeline. May be completed in time.