以下为句子列表：
英文: A deficiency of potassium leads to a characteristic red or purple coloration of the leaves, poor root growth, and flower and fruit formation.
中文: 缺乏钾会导致叶子呈现红色或紫色，减少了根的生长以及花和果实的形成。
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英文: Abstract: The development of the stainless steel coloration technique was reviewed in this paper.The principle of coloration was discussed.The advantage of the colorful stainless steel was introduced.Finally,further research efforts were briefly prospecte
中文: 文摘:综述了不锈钢着色技术在国内外的研究进展，讨论了着色技术原理，介绍了彩色不锈钢的优异性能，并对未来这一技术的发展提出了展望。
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英文: According to a study by the Veterans Affairs Boston Healthcare System, cigarette smoking can lead not only to tooth dis coloration and gum disease, but often to the need for root canal treatment as well.
中文: 根据退伍老兵事务波士顿保健系统公司进行的一项研究，吸烟不仅会引起牙齿变色和齿龈疾病，而且通常会导致必须进行根管治疗。
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英文: Advanced purifying technology powerfully accelerates the whitening process, helping to prevent formation and spreading of dark pigmentation. It also protects from future discoloration and restores long-lasting clarity to the skin.
中文: 独特的全效美白净化效果，能淡化日晒及其他环境因素所引起的黑斑或色斑，同时预防色素形成，减缓新色斑的产生。
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英文: All Otopharynx have three characteristic dark spots on the flank, but these eventually become completely masked by the dark blue breeding coloration of males.
中文: 金头蓝孔雀体侧有明显的3个黑色斑块，不过在雄性鱼的变色后，这些板块会隐匿在深蓝色之下。
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