The more expensive 3G/Wi-Fi model, which starts at $629, won't be released until late April.
售价更昂贵（至少629美元）的具备3G/WiFi的型号要到4月底才会公布。
The price of Amazon’s e-reader just keeps on dwindling, including an ad-supported Wi-Fi model for as little as $114, and a 3G Kindle priced at $139.
亚马逊电子阅读器价格持续低迷，其中支持广告的wi-fi版本只需114美元，而3G版本也降到了139美元。
It is proved that the fundamental diagram of the average traffic flow speed as the function of the car density for the new model is exactly the same as for fi model.
证明新模型的基本图，即车流渐近稳态的平均速度与道路上的车辆密度之间的函数关系与FI模型的完全相同。
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