造成这种差别的原因很清楚，当你看到网络连接连接速度是如何分布的（如下图）。
The reason for this difference is clear when you see how connection speeds are distributed.
造成这一情况有许多原因，如下的原因就很典型。
There are many reasons responsible for this instance, and the following are the typical ones.
得出如下结论：大坝的自重和坝中上高程地基减弱是造成拱坝下游面最初发生纵向裂纹的主要原因；
The results shown that: weight and weak foundation close to middle-upper dam lead the vertical cracks to propagate along the downstream wall;
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