I lost some important documents, but three days later, I found them with the help of the police.
我知道加第一逗号是因为 并列连词but前面一般要加逗号,但是加第二个逗号的原因是为什么呢?谢谢老师!
I lost some important documents, but three days later, I found them with the help of the police.
=I lost some important documents, but I found them with the help of the police three days later.
我丢失了一些重要的文件,但三天后,我在警察的帮助下找到了它们。
第2个逗号把时间状语提前表示强调,同时也表示说话人中途停顿。
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