求翻译：基坑开挖时须进行降水，各土层在长时间降深的条件下会产生较大的变形，从而引起地面沉降并导致附近建（构）筑物的不均匀沉降造成开裂、变形。是什么意思？

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Digging pit shall be carried out when the soil layers in precipitation, deep down under conditions of long time will have a greater deformation, thus causing surface subsidence and lead to buildings near the building (Structure) resulting from uneven settlement cracking, deformation.

When structure excavation must carry on the precipitation, various soil layers fall under the deep condition in the long time to be able to have the big distortion neighbor, thus causes the surface subsidence and causes to construct (construction) builds the differential settlement to create the deh

Excavation of Foundation pit precipitation, soil layer in a long time can produce large deformation under drawdown conditions, which led to land subsidence and lead to a nearby building (construction) of uneven settlement of building caused by cracks, deformation.

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