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简介：The second valley entrance is wide, low and flat. It is much wider than the first valley entrance, and the detour distance is not far. Compared with the rugged and difficult first valley entrance and the third valley entrance, From a long distance, this valley is the most suitable. However, the mountain topography and trees are similar to those at the first valley, so they are not suitable for hiding ambushes and are easily discovered by Jianlu.