你sale他贏一次，你trade他贏兩次。你賣給他們要比自己賣便宜，你買他們的要比從私人買貴。

來源: 徒勞於 2023-10-06 12:03:31 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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