在某种程度上，这意味着它们的成本比化石燃料要低——当然是当你给汽车加油的时候。
In a way that means they have to cost less than fossil fuels—certainly when you're filling up your car.
你必须给汽车加油才能开动它。
而在腹地之外，人们为了给汽车加油，攒钱给孩子上大学或者为退休金而拼命工作。
And out in the hinterlands, people are struggling to fill up the gas tank or save for their child's college education or pay for their own retirement.
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