以下为句子列表：
英文: 12 bar blues started out as a combination of European popular songs, African rhythm and tonality which developed in cotton fields.
中文: 12小节布鲁斯的根源多处可循：欧洲流行乐，非洲节奏和棉花地里发展起来的劳动号子都逃不了干系。
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英文: A (2+ε)-approximation algorithm is presented, where ε>0 can be made arbitrarily small.
中文: 给出了一个(2+ε)-近似算法，ε>0可以任意小。
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英文: A branch and bound algorithm for solving a class of nonlinear 0-1 knapsack problems is proposed, in which branching is common 0-1 variables one and a better feasible solution is found by a simply integer heuristic method as well as a lower bound of the op
中文: 摘要构造出了一类可分离非线性0-1背包问题的分枝定界算法，分枝的过程是普通的0-1变量分枝，用简单的取整启发式法确定更好的可行解；而在每个分枝结点处用线性松弛技术确定了它的子问题的一个线性规划松弛逼近，由此得到最优值的一个下界。
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英文: [Objective] To reduce the mortality of patients after heart surgery with a goal-directed therapy algorithm. [Methods] Prospective study of patients undergoing surgery utilizing a goal-directed therapy algorithm in the postoperative period.
中文: 摘要目的对于心脏术后的患者给予连续监测血乳酸，并根据血乳酸水平调整治疗方案，以确定这种方法是否能改善患者的预后。
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英文: 《Guiding Clinical Nursing with the theory of “Biological Clock”》Abstract The importance of timing nursing was studied according to regular change of body rhythm (biological clock).The closed relationship between illness observation,clinical use of medicam
中文: 摘要从人体节律的规律性变化(生物钟)，探讨了实施时间护理的重要性，并详细阐述了病情观察、临床用药与实施时间护理的密切关系。
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