从北部高纬度地区看到的这些迷人的北方的光，也被称为北极光，正慢慢变成更加熟悉的景象。

From high northern latitudes these mesmerizing northern lights, also known as the aurora borealis, are becoming a more familiar sight.

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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。

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.

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历史上，作为中国内陆的主要河流- - -淮河，是中国南方和北方的传统分界线，它穿越江苏北部流入黄海。

Historically, the river Huai he, a major river in central China and the traditional border between north China and South China, cut through north Jiangsu to reach the Yellow Sea.

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