But until they are widely available, simple changes to the internal combustion engine-and the way we drive-could as much as double gas mileage.
但是，在这些汽车还没有广泛使用之前，对内燃机简单的改变以及我们驾驶方式的改变能使汽油里程加倍。
The entrance of West gas into Shanghai has made it a double-gas supplied city.
前言： 随着“西气”进沪，上海形成了“东、西”双气源供气的格局。
The entrance of West gas into Shanghai has made it a double-gas supplied city.
前言： 随着“西气”进沪，上海形成了“东、西”双气源供气的格局。
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