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With a full tank, you can go for miles at any chosen speed. When the gas tank is nearing empty, there is the need to drive slower to conserve gas consumption until the tank is filled again.
这就像给你的汽车加油，油箱加满时，你可以选择任何速度前进数英里，当你的油箱快没油了，你就得尽可能慢行来使你的车坚持到再次加油的时候。
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