A statewide crackdown on dirty diesel lorries and a push to expand use of zero-emission vehicles are also a big part of the story.

另外一个重要原因是在全国范围内强制取缔不清洁的柴油卡车以及扩大零排放车辆的使用。

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This paper presents a novel zero voltage and zero current switching (ZCS) PWM push pull three level converter in which the voltage stress of switches is input voltage.

本文提出了一种新型的零电压零电流开关pwm推挽三电平直流变换器，其中开关管的电压应力为输入电压。

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Several zero voltage and zero current switching PWM push pull three level converters are proposed.

最后，本文还提出了另外几种零电压零电流开关PWM推挽三电平直流变换器。

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These could, together, wipe 2% off GDP, enough to push growth back to zero or lower.

ECONOMIST: The recovery runs out of steam

Lower import prices would then push inflation dangerously close to zero in America and Europe.

ECONOMIST: Can a cheaper yen rid Japan of deflation?

The authorities have been forced to push interest rates close to zero in order to give investors a one-way bet.

ECONOMIST: The impossible task of eliminating uncertainty