People walk along frozen Lake Michigan in Chicago, the United States, Jan. 31, 2019. Chicago, the biggest city in the U.S. Midwest, was struck by the polar vortex with the minimum temperature reaching minus 30 degrees Celsius in the city. (Xinhua/Wang Ping)
Chicago's minimum temperature down to minus 30 degrees Celsius
Source: Xinhua| 2019-02-01 14:03:29|Editor: mym
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