incremental portion [计] 增量部分 ; 增加额 ; [计] 增长部分
Refactoring is an incremental activity hence it touches some portion of the system at a time.
重构是一种增量式的活动，因此它每次只会接触到系统的一部分。
Mozy also backs up based on file changes, only uploading the portion of a file that has changed and not the entire file all over again (meaning quicker incremental backups after the initial backup).
Mozy还可以检测文件变化而进行备份，只备份变化后的部分而非整个文件(这意味着更快的处理速度)。
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