FAME products can be tracked directly at the pump什 ...？ 不同意4楼的意见，前面句中的exceptions和后面间隔几句后出现的fame products however do have a high percentage of oxygen which enables them to be tracked directly at the pump.无对应关系。这个exception应该是指多说是16-20个碳的碳链，而有一些例外含碳数不在16-20范围内。 fame products however do have a high percentage of oxygen which enables them to be tracked directly at the pump.是接着前文：fame与标准柴油中的16-20碳结构类似，只是几乎不含硫、氮、芳烃等，但其含氧量比较高，以至于可以在泵处检出。查看更多
麻烦能帮忙翻译一句话？ interestingly,it was shown that thiophene addition to cu/al2o3 catalyst promoted the catalytic activity for the synthesis of crotyl alcohol from crotonaldehyde hydrogenation。 有趣的是，实验表明加入cu/al2o3催化剂的噻吩可提高巴豆醛加氢还原反应的催化活性，从而生成巴豆醇查看更多
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