以下为句子列表：
英文: Currently one of the major challenges associated with making MgB2 a useful superconducting material is to increase its critical current density at higher magnetic fields.
中文: 要将硼化镁制成有用的超导材料，目前最主要的挑战之一，就是如何在较高的磁场下增加临界电流密度。
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英文: Sure enough, we found that in as little as two hours this process produced very high purity MgB2 in the form of a loosely sintered pellet (like sandstone).
中文: 不出所料，在短短的两个小时内，我们发现这个制程确实能制造出零散烧结状的高纯度硼化镁颗粒（看起来像砂岩）。
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英文: The critical current density of pure MgB2 is comparable to that of triniobium tin at low magnetic fields but falls off much more rapidly at higher fields.
中文: 在低磁场下，硼化镁的临界电流密度与三铌化锡相当，但是在较高的磁场下却下降得很快。
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英文: This is not good news if the goal is to use MgB2 in magnets, which are meant to produce a strong field.
中文: 如果我们打算用硼化镁来制作可以产生强磁场的磁铁，这可不是一件好事。
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