In the early days of IT programming, most software estimates were produced in a bottom-up manner.

在早期的IT编程中，大部分软件的评估使用自底向上的方式。

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If procedural programming is top-down, event programming is bottom-up.

如果过程化编程是自顶向下的，事件编程是自底向上。

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If procedural programming is top-down, event programming is bottom-up.

如果过程化编程是自顶向下的，事件编程是自底向上。

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