以下为句子列表：
英文: A few years back researchers thought that hydrogen could be extracted chemically onboard from liquid hydrocarbons such as methanol, but those schemes did not pan out.
中文: 几年前，研究人员认为，可以在车上直接利用化学方法，从甲醇等液态碳氢化合物中释放出氢气，但结果并不成功。
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英文: Abstract: The paper interprets alternant polarization phenomen on of even alternant hydrocarbons by discussing charge density on every position of even alternate when it is polarized using perturbational molecular orbitals( PMO).
中文: 文摘:本文用微扰分子轨道法(PMO)讨论了偶交替烃被极化时各位置上的π电荷密度，解释了偶交替烃π电荷的交替极化现象。
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英文: Abstract: Through the in-situ experiments of removing the petroleum hydrocarbons in polluted groundwater,the removal mechanism of the petroleum contaminants by the biological activated carbons, the micro-patterns and the biological characteristics of the
中文: 文摘:研究了生物活性炭去除地下水中石油类污染物的机理、活性炭表面生物膜的微观形态及生物学特性。
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英文: All oil companies must work hard to replace the hydrocarbons they use up.
中文: 所有的石油公司都必须尽量争取在石油开采完之前找到其他油田。
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英文: And although the U.S. auto industry has cut exhaust emissions substantially since the unregulated 1960s—hydrocarbons dropped by 99 percent, carbon monoxide by 96 percent and nitrogen oxides by 95 percent—the continued production of carbon dioxide causes c
中文: 从毫无法规管制的1960年代至今，虽然美国汽车业界已经大幅减少排放的废气（碳氢化合物降低了99%，一氧化碳降低了96%，氮氧化物降低了95%），但持续产生的二氧化碳仍是个问题，因为它可能影响地球的气候。
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