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Unfortunately, the solid propellants—usually aluminum fuel and ammonium perchlorate oxidizer—burn fairly inefficiently, are toxic to the environment, and are difficult to fabricate and handle safely.
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然而固体推进剂（通常是铝燃料和过氯酸铵氧化剂）燃烧效率颇低、对环境有害，而且很难安全地制造和操作。 |
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Unfortunately, the special alternative should be performed for some cases, in order to the purpose of appropriate treatment.
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在少数不得已的情况之下，必须采取特殊的替代方法，以遂行治疗过程顺利之目的。 |
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Unfortunately, the things people naturally try to do after a break up actually end up pushing their ex further away... even though it seems like the right thing to do at the time!
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很不幸的是，分手后人们自然而然会做的事情恰恰是把前男/女友越推越远，尽管当时看起来是正确的！ |
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Unfortunately, the time has not yet rubber and plastics, the material is biodegradable, so future generations heirs.
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可惜，那时还没有橡胶和塑料，用的都是可降解材料，所以后世不传。 |
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Unfortunately, the toilet was lost for more than 3000 years before being 4)reinvented in England during the sixteenth century.
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不幸的是，马桶失传了三千多年，直到十六世纪时英国才再度发明它。 |
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Unfortunately, the young man discovers that his nemesis is now a powerful vampire with a coven of allies.
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不幸地，年轻的男人发现他的复仇女神现在居然是女巫协会的一个强大的吸血鬼。 |
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Unfortunately, there are a lot more “self improvement” books than there is self improvement.
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遗憾的是，现在有很多标榜能促进自我进步的书，而真正做到的却太少了。 |
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Unfortunately, there is no rule that will help you to look at a phrasal verb and always know whether it is separable or nonseparable.
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可惜的是，并没有规则可以帮助读者分辨一个片语动词可分离与否。 |
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Unfortunately, there is nothing to make people feel optimistic. Even though security has improved, they are still frightened to go home. Everyone told me they are desperate for peace.
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不幸地，没有什麽可以令人感到前途乐观的事，即使安全条件已经改善，他们始终害怕回家。每个人都告诉我他们想要和平。 |
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Unfortunately, there is very few evidence that big companies are willing to invest&nbs p;a huge sums of money in a place withou t sufficient basic projects, such as supplies ;of electricity and water.
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然而，很少有证据表明大公司愿意把巨额的资金投到一个连水电这些基础设施都不完善的地方去。 |
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Unfortunately, there was a severe user account data problem due to Deicide servers' technical problem.
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非常不幸地伺服器中的帐户资料出了问题,原因是技术部的同事出了问题. |
