以下为句子列表：
英文: In order to solve several problems when studying visualization of multi-source spatial data, the authors propose two new conceptions, display sequence control and symbol display control style, The former is used to manage visualization of multi-source dat
中文: 摘要提出了显示顺序控制和符号显示控制样式两个新概念，解决了多源数据的综合管理显示问题，改善了地图要素在不同显示比例尺段的显示效果。
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