Companies have attempted wireless charging in the past, but it has not been on the level the WiTricity hopes to achieve.

许多公司过去都曾尝试过无线充电，但并未达到WiTricity希望实现的水平。

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There are even discussions at national level, e.g. in the UK and Germany, on extending congestion charging to all roads.

在某些国家，如英国和德国，正在讨论在所有道路上收取拥堵费的问题。

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Notice that as the battery level approaches 100%, the charging current gradually decreases.

要注意的是，随着电池电量达到100%，充电器的电流逐渐减少。

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If you go to the level 2 charging station, called a fast charging station, 240 volts, now we do care about that.

FORBES: ComEd Wants To Know Where You're Charging Your Car

ECOtality will install the company's Blink electric vehicle charging stations across the country, and will install nearly 15, 000 Level 2 chargers at residential and commercial locations, and over 300 DC Fast Charging ports at public and commercial sites now, and throughout 2011.

ENGADGET: ECOtality teams with Sprint to connect Blink EV charging network

Keeping basic consumption cheap, and charging heavily only above a certain level, means that user-fees do not bear down on poor people.

ECONOMIST: California's economy