We need to press on with battery research for plug-in and hybrid vehicles, and expand the use of clean diesel vehicles and biodiesel fuel.

我们需要继续进行电动车和混合动力车的电池的研究，并扩展洁净的柴油车和生物柴油的使用。

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And Volvo's V60, which the company says is the world's first diesel-electric plug-in hybrid in production, offers a package of solutions to such drivers, he insists.

BBC: Volvo eyes 'responsible' car buyers