单词：duplicate file
duplicate file的用法和样例：
例句
- The data in the file is not copied.而不会复制文件中的数据。
- Copying a file creates a duplicate of that file in another place.复制文件操作会在另一个位置创建该文件的副本。
- The backup file has an unrecognizable format.无法识别备份文件的格式。
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