Pictured here: Two polar bears spar, or play fight, in Churchill, Manitoba.

图为两只北极熊在争吵或打闹，摄于马尼托巴丘吉尔。

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Clouds over Manitoba, Canada, are bathed in green light from an August 4 aurora.

8月4日加拿大马尼·巴托上空的云朵沐浴在绿光之中。

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Regions around the Mississippi River and the Manitoba Province in Canada were hardest hit.

美国密西西比河流区域和加拿大的曼尼托巴省成为重灾区。

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The Winnipeg, Manitoba, native also spent nine years as head coach of the University of Manitoba.

WSJ: Longtime NHL assistant coach Fleming dies at 62

Mounted copies of the letters will now be presented to the Lieutenant Governor of Manitoba.

BBC: Red River letters

The key enzyme targeted by the researchers, from the University of Manitoba is called NQO1.

BBC: NEWS | Health | Food extract boosts cancer drug