非常感謝。有空會細看，掃了一眼，感覺人口密度高的國家/地區憂鬱症低，反之則高，這也是我的直覺。

來源: 欲千北於 2015-09-06 17:51:51 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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