吉姆和埃伦走下门前的小路，妈妈站在门口挥手，像母亲在向一对儿女告别，直到他们远离了大门。 母亲心里永远有放不下的心事—交叉路口，突如其来的疾病。

Jim and Ellen walking down the path with mama at the door, waving like a mother, waiting until they are beyond the gate, forever worrying about crossing roads and unsuspected illnesses.

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当然，刚开始的时候，这类生物燃料还是只能与传统的汽油或柴油混合使用，但迟早都有能够单独使用的一天。 到了那一天，我们就可以永远告别利用石油来提炼汽油的时代。

And although these biofuels will probably first be supplied preblended with traditional gasoline or diesel, one day we may use them alone and say good-bye to petroleum-based gasoline forever.

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那时，杰克逊将在去蒙大拿的回家路上，这次可能是永远的告别了。

By then, Jackson will be on his way home to Montana, perhaps for good this time.

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