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VOA慢速英语:US Cities Celebrate BiketoWorkDay
2016-05-21来源:VOA
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commuter - n. someone who travels regularly to and from a place and especially between where you live and where you work
sponsor - n. a person or organization that pays the cost of an activity or event (such as a radio or television program, sports event, concert, etc.) in return for the right to advertise during the activity or event
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