以下为句子列表：
英文: After its angles have been beveled, guaranteeing a neat fit with the case, the sapphire crystal is chemically polished on both sides.
中文: 对镜面边缘进行斜削，以确保其与表壳的精确配合，再将两面进行化学抛光。
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英文: Sapphire crystal is hexagonal, rising from a flat base, and the researchers found that most vertical slices of sapphire apparently expose constituent aluminum and oxygen atoms in layouts that promote the formation of nanotubes in orderly rows.
中文: 蓝宝石晶体为六角形，底部为平面，研究人员发现蓝宝石的垂直切片，大多会使蓝宝石成份中的铝和氧原子暴露出来，而且其排列方式可促使奈米管排成规则的形状。
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