前进增量 Go Delta
当前时间增量事件 current time increment event
前缀增量和减量操作符 Prefix Increment And Decrement Operators
前瞻性长期增量成本 LRIC
不应该编写依赖于前增量和后增量之间差异的代码（对于 C 语言来说也是如此）。
You should never write code that depends on the difference between preincrement and postincrement (and that goes for C, too).
每个连续的增量映像都包含前一个增量映像的全部内容，以及前一个完全备份以后所做的更改。
Each successive incremental image contains the entire contents of the previous incremental image, and the changes since the previous full backup.
小于前值的提交度量应被忽略或造成底层增量重置。
Submitted measurements that are less than the prior value should either be ignored or cause a reset of the underlying delta.
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