以下为句子列表：
英文: Automobile have been designed wihich operate on liquid hydrogen , but these systems give rise to seemingly unavoidable problems arising from the handling of a cryogenic liquid.
中文: 汽车一直被设计成以液体氢为燃料来运行。但是这样的系统产生了看上去不可避免的问题，这个问题是无法处理剩余液体燃料。
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英文: For liquid hydrogen system, Helium purge is required after or before nitrogen purge.
中文: 对于液氢系统用氮气吹扫之后，还要用氦气吹扫。
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英文: Operation of liquid hydrogen storage tanks requires specific instructions and training. Storage tank and surroundings must be in perfect condition and cleanliness.
中文: 液氢贮罐的操作需要特别的工作指引，人员必须经过培训。贮罐本身和它的周围环境必须保持清洁，并处于良好的工作条件下。
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英文: The shuttle, in contrast, requires three rocket engines built into the vehicle, an external tank of liquid hydrogen and oxygen to feed those engines, and a pair of solid-fuel boosters.
中文: 反观太空梭升空则需要使用三具内建的火箭引擎，外附装有液态氢和液态氧的燃料箱，以及一对固体燃料助力器。
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