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mapL

修改了山谷的地形生成：
　　1. StreamCount（小溪数量）改为零，生成的地形只有一条宽阔的河流没有小溪；
　　2. FlatAreaCount（平坦区域数量）扩大到原始值的10倍，生成的地形更像没有丘陵的平坦盆地。

Modified the terrain generator for VALLEY:
1. The StreamCount (number of streams) has been changed to zero, resulting in a terrain with only one wide river and no small streams;
2. The FlatAreaCount is increased to 10 times the original value, resulting in a terrain that resembles a flat basin without hills.