第一，一个削弱这项“强制要求”的伎俩，是用混合燃料替代纯zev，并让“部分零排放车辆”“PZEV”更好利用汽油。
First, one ploy to weaken the Mandate was the idea of trading off pure ZEV production for hybrids, and giving "PZEV" for better gas mileage.
踏板车使用标准的镍氢电池作动力，但卡门的研究部门正在研制一种能再次利用其本身大部分热量的零排放发动机。
The scooter is powered by standard nickel and metal hydride electric batteries. However, Kamen's research firm is working on an emission-free engine that recycles much of its own heat.
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