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英国的一些研究者已经发现肮脏可能会令人更高兴。
Some researchers in Britain have even found what they think might be dirt that can make people happy.
经过2年共4000余次采访，研究者们有了一些惊人的发现。
After 4,000 interviews done over a two-year period, the researchers came up with some surprising findings.
经过2年共4000余次采访，研究者们有了一些惊人的发现。
After 4, 000 interviews done over a two-year period, the researchers came up with some surprising findings.
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