increase by 17 percent.shortened by half. 增长了 缩短了多少 为什么用by？ 能不能举几个复杂的类似例

Question

如题所述

Answer 1

这是固定用法。例如：
The production is increased by 17 percent, and the time is shortened by half.
产量提高了百分之十七，而时间缩短了一半。