施工最困难的隧道是在一条河的下面一定深度处或水域其他部分中开挖隧道。
The most difficult tunneling is that undertaken at considerable depths below a river or other body of water.
根据现行计算方法，堤坝下游坡脚处渗流水力坡降具有奇异性，这给工程设计中判别渗透安全性带来困难，同时与实际情况也不符合。
The singularity of hydraulic gradient, which is always found in the calculation of seepage at the toe of dam, is not accord with the reality and makes the trouble in judging the safety of the dam.
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