以下为句子列表：
英文: Anesthetics have become a mainstay of modern medicine, and every year 27 million people in the U.S. alone benefit from the pain relief, sedation and unconsciousness that they provide.
中文: 麻醉药已经成为现代医学的支柱，光是美国每一年就有2700万人享受了麻醉药的好处──令他们失去知觉、镇静下来，或者失去意识。
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英文: Exactly how anesthetics work has remained an enigma since their first use in 1846.
中文: 医界自1846年开始使用麻醉药，但一直就没搞清楚它们是怎样发挥效用的。
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英文: Local anesthetics that temporarily inactivate such voltage-gated sodium channels currently treat a variety of different pains, particularly those arising from a trip to the dentist.
中文: 目前，有许多不同形式的疼痛（特别是去一趟牙医诊所引起的），可利用局部麻醉剂来止痛，原理就是将这种电位控制型的钠离子通道暂时去活化。
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英文: Over-the-counter topical anesthetics and antimicrobial mouthrinses may provide temporary relief.
中文: 使用非处方的局部麻醉剂和抗菌漱口水也许能暂时的减轻痛苦。
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英文: The action of any anesthetics within the body is due to two factors: its physical property of solubility in fats and water and its chemical characteristic of combining with nere tissue.
中文: 任何麻醉剂在体内的作用都取决于两个因素：一是物理因素，即其在油脂和水中的溶解度；二是化学因素，即其与神经组织结合的能力。
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