When you can't get a 4g connection, the fallback is to use Sprint's 3g network, which is based on EV-DO (Evolution Data Optimized) technology.

当你连接不上4 G网络的时候，你所能依赖的就是Sprint的基于EV - DO(演变数据优化)3g网络了。

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The next steps are to finish a go-kart–size one-seater EV prototype, boost the system's power, and perfect that car's on-the-move recharging.

下一步准备完成一个微型赛车大小、单座的原型机，而且提高系统功率并完善车在移动中的充电功能。

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Instead, researchers are chipping away at problems in smaller sizes, with a specific focus on the power plant — the source of most EV emissions.

反而研究者们在小问题上小打小闹，把注意力放在发电厂上——电动汽车排放的源头。

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The EV-1 was on the market in the 1990s, but GM discontinued it because of impracticality.

VOA: standard.2010.07.30

For starters, you've got to be on EV-DO or WiFi, because 1xRTT (in addition to being ridiculously slow) would block incoming calls when active.

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Web surfing on an EV-DO connection may not quite rival a home broadband experience, but it's often more than adequate for most Web tasks.

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For Nextel, the benefit of EV-DO is that handsets already exist, and it is possible to implement push-to-talk functionality, on a par with Nextel's existing service, on an EV-DO network.

ECONOMIST: And then there were four