以下为句子列表：
英文: This paper discusses the cartography elements used as spatial cognition in the course of user navigation in light of spatial cognition and the limitation of hardware resource in order to improve the map efficiency as spatial cognition tool in different en
中文: 摘要基于地图功能的改变和移动服务独特的用图环境，提出采用“空间认知对等地图”以满足导航用户的认知需求；介绍“空间认知对等地图”的概念和地图中应表现的认知信息、地图的简化过程和简化过程中的拓扑关系维护，给出地图的简化效果。
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英文: For this design,SPWM waveform data only in one / sinuous cycle are required to be stored in ROM that is constructed with internal hardware resource of the FPGA.
中文: 该电路用一片用户可编程门阵列（FPGA）芯片实现，电路设计只需将／周期的SPWM波形数据存于FPGA内部硬件资源所构造的ROM中，因此减少了硬件开销。
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