以下为句子列表：
英文: At each step, some arithmetic or logical operation is performed on some data.
中文: 每个步骤中，一些算术和逻辑操作作用在一些数据中。
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英文: Based on the HSV color model, the method regards the saturation as principle to distinguish the foreground and background, then uses mathematic morphological operation and boundary detection technique to extract valid district of steel pieces.
中文: 采用HSV颜色空间，并以饱和度为主区分前景和背景，再综合运用数学形态学运算及边界跟踪技术提取出钢块的有效区域。
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英文: Determines the logical operation used to put pen or brush colour onto the graphics device. Defined in a graphics context.
中文: 绘图模式：确定将钢笔或者刷子工具的颜色添加到图形设备上的逻辑操作。在一个图形内容中定义。
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英文: The paper discusses the methods of multi-objective ecological operation of reservoirs, which covers the establishment of legislation systems; water demands for the basic ecological functions of downstream river channel; reservoir discharge patterns simula
中文: 文中讨论了水库多目标生态调度的方法，包括建立相应法规体系；保证维持下游河道基本生态功能的需水量；模拟自然水文情势的水库泄流方式；进行水库泥沙调控及水库富营养化控制；减轻水体温度分层影响；进行防污调度以及增强水系连通性等方面的调度技术。
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英文: This paper analyzes the limitations of the measures taken in current reservoir operations arid points out that multi-objective ecological operation of reservoirs should be carried out in order to meet the needs of river ecosystems while implementing vario
中文: 摘要分析了现行水库调度方法的不足，指出应在实现社会经济多种目标的前提下，兼顾河流生态系统需求，实行水库的多目标生态调度。
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