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This means "it's a long story," and it's used the same way as in English
Neutral
我如何开始学英文的,说来话长。 | Wǒ rúhé kāishǐ xué yīngwén de, shuō lái huà zhǎng
How I started learning English is a long story
[Source]
为什么因特网在我们的生活中发挥了重要的作用?这说来话长 | Wèishéme yīntèwǎng zài wǒmen de shēnghuó zhōng fāhuīle zhòngyào de zuòyòng? Zhè shuō lái huà zhǎng
Why does the internet play an important role in our lives? It's a long story
[Source]
It's a long story
Long story
None
None
《红楼梦》(Hóng Lóu Mèng) by Qīng (清, 1644-1911) author 曹雪芹 (Cáo Xuěqín). Often translated in English as "A Dream of Red Mansions," 红楼梦 is one of China's four great classical novels
This chengyu comes from a line in the work listed in the "Origin" section above