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真是一言难尽，恐怕我不能告诉你。
It's a long story. I'm afraid I can't tell you.
youdao
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这个故事的起源一言难尽。
The story roots in a long story.
youdao
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说起它呀，真是一言难尽。
Talking about it is you really untold.
youdao
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一言难尽。说来话长。
It's a long story.
youdao
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一言难尽。说来话长。
It's a long story.
youdao