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Registration 會員註冊

    1.Usernames must be at least 8 characters long, up to 20 characters long.
    用戶名至少需要8個字符，長度不得超過20個字符。。
    2.Letters a-z, numbers 0-9 and _ are allowed.
    字母"A- Z"，數字"0-9"和"_"都是允許的。
    3.Passwords must be at least 8 characters long, up to 20 characters long.
    密碼至少需要8個字符，長度不得超過20個字符。
    4.Your password must be contain at least 1 letter and 1 number.
    至少有一個字符的密碼必須是英文或數字。
    5.Usernames and passwords are cAsE_sEnSiTiVe.
    用戶名和密碼區分大小寫。