上榜的北美城市包括芝加哥、渥太华和旧金山。
North American cities including Chicago, Ottawa, San Francisco are also on the list.
这场冷空气造成部分地区学校取消或者延迟上课，包括芝加哥，温度已经达到零度。
It's caused districts to cancel or delay school days in several cities including Chicago where wind chills were well below zero.
新投资者包括芝加哥金融家山姆·泽尔、演员希拉里·斯万克和购物中心大亨赫伯•西蒙。
New investors include Sam Zell, the Chicago financier, actress Hillary Swank and Herb Simon, the shopping mall magnate.
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