A bitterly cold Arctic air mass has caused temperatures to plummet across much of the northern hemisphere, where parts of the US, Canada and Siberia have recorded temperatures below minus 40C.
一股极寒的北极气团导致北半球大部分地区气温骤降,美国、加拿大和西伯利亚部分地区的气温均低于零下40摄氏度。
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