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.
一股極寒的北極氣團導致北半球大部分地區氣溫驟降,美國、加拿大和西伯利亞部分地區的氣溫均低於零下40攝氏度。
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