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1.The UDF is a popular online platform for learning and sharing knowledge.
UDF是一个受欢迎的在线学习平台，用于学习和分享知识。
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2.The UDF team is responsible for designing and implementing the new system.
UDF团队负责设计和实施新系统。
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3. The UDF is used to calculate the distance between two points on a map.
UDF用于计算地图上两点之间的距离。