本文对冰覆盖下的河道水流进行了区域划分，给出了区域分界面上的水流条件。
The paper divides regionally the flow under the ice cover and gives flow conditions of the regional boundary surface.
这个区域是以阿尔弗雷德·华莱士的名字命名，在19世纪，他发现在这条分界线两边的动物群之间存在着非常明显的差异。
This is an area named after Alfred Wallace, who in the 19th century noted that the land-based fauna on either side of this line was distinctly different.
轮廓与边界定义了目标的外表形状，确定了区域之间的分界线，它们是人类与计算机进行目标识别的重要特征。
Contours and boundaries that define object shape and indicate outer limits for regions. They are critical for human or computer recognition of objects.
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