求翻译：经设计现场勘查后，设计方案进行了调整。调整后的设计可见下平洞加长了，因此引水隧洞工程，下平洞开挖至关重要，下平洞由业主指定分包商承担施工任务是什么意思？

Exploration designed site, the design has been adjusted. Design can be seen in the adjusted lower adit extended diversion tunnel works under the adit excavation is essential, under adit specified by the owner and subcontractors undertaking a construction task

The design on-site survey, design program has been adjusted. After adjusting the design can be seen at the next level, and therefore a diversion Tunnel project, dig the hole, it is essential that the flat-owners-specified by sub-contractors for construction work

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After the design scene, design has been adjusted. Adjusted design of visible lower adit extended, diversion tunnels, tunnel excavation under critical, adit borne by owners specify the subcontractor under construction

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