The answer seems to be that, simply, late August is the period when polar bears in northern Alaska head north on to the sea ice, and that is what she was doing.
答案看起来是这样的：就因为八月底是阿拉斯加北部的北极熊游向北方的海冰的特定时段，文中这只母熊也正是这样做的。
When viewed from the front or the side the head bears a general resemblance to a well-blunted clean wedge, being smooth in outline.
不论从前面还是从侧面观察头部，共同之处在于都可以明显地观察到倾斜的楔形，轮廓平顺。
Both in front and profile view, the head bears a general resemblance to a well-blunted wedge, being smooth and clean in outline and nicely balanced in proportion.
不论从前面还是从侧面观察头部，共同之处在于都可以明显地观察到倾斜的楔形。轮廓清晰、平顺，精致且比例协调。
Both in front and profile view, the head bears a general resemblance to a well-blunted wedge, being smooth and clean in outline and nicely balanced in proportion.
不论从前面还是从侧面观察头部，共同之处在于都可以明显地观察到倾斜的楔形。轮廓清晰、平顺，精致且比例协调。
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