... charging by induction感应起电 charging by sharing授受起电 charging time constant充电时间常数，充电时间常量 ...
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charging g by sharing 授受起电
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Down the line, Foursquare hopes building up a base of active users will give it options for bringing in revenue, for instance by charging merchants to host discounts or sharing revenue with AmEx or another credit-card company.
WSJ: AmEx Teams Up With Foursquare
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