以下为句子列表：
英文: Although the term is ubiquitous in today's world, explaining democracycan be challenging.
中文: 虽然民主一词今天已经传遍世界，但要解释它的确切含义并不容易。
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英文: Although this theoretical model is simplistic and needs to be adapted to specific situations, it does appear to confirm our explanation for why scale-free networks are so ubiquitous in the real world.
中文: 虽然这个理论模型过于简化，而且必须依据特定状况进行调整，但似乎对于无尺度网络普遍存在于真实世界的解释，提供了佐证。
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英文: Another ubiquitous casual item is the pair of jeans.
中文: 牛仔裤是另一个随处可见的休闲服饰。
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英文: But if introns do not code for protein, then why are they ubiquitous among eukaryotes yet absent in prokaryotes?
中文: 既然插入子不具有蛋白质编码，为什麽又会在真核生物的基因组中处处可见，而原核生物却没有呢？
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英文: By midweek, heavily armed officers were ubiquitous on the streets, and helicopters with searchlights a nightly reminder that a serial killer was still on the loose.
中文: 到周中的时候，全副武装的警察在大街上随处可见，装有探照灯的直升机每天晚上都提醒人们这位连环杀手依然在逃。
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