用现有的汽缸的话，在车辆行驶了20英里之后就需要更换或是加燃料，那司机们就要频繁地跑加“油”站了。
Current cylinders would need changing or charging after about 20 miles. Which would still cover a lot of commutes and trips to the grocery store.
原来，家在外地的刘宁是一名长途卡车司机，常年在外跑运输，正当壮年的他半个月一个月回家一趟是常有的事。
It turned out that Liu's home field in a long-distance truck drivers, transport running out all the year round, while the prime of life, he half month trip home is common.
司机很早就知道，在高速路上减速可以用一加仑油跑更长的路。
Drivers have long known that slowing down onthe highway means getting more miles to the gallon.
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