the password must be at least 8, and must have at least one alpha character, numeric character and special character 這是甚麼意思?可以幫忙翻譯一下嘛?>?

以下是七年前Knowledge+ 的問題與河小豚大師的解答
Your password must have at least 8 characters and a mix of letters and numbers with no spaces. It must not have been used in the past year.
麻煩會英文的大大們幫忙翻譯一下
更新: 那這一句呢
passwords must contain at least one uppercase letter.
您的密碼必須至少 8 個字元的字母和數位的組合與沒有 spaces. It 必須不被用在過去的一年。密碼必須包含至少一個字母大寫。
河小豚 · 7 年前.

為何7年前合理的句子，今年會變成這樣?
The password must be at least 8, and must have at least one alpha character, numeric character and special character。
以上句子 at least 8 漏掉了characters，必需是 at least characters
Alpha character網路抄錄資料定義如下(O，網路資料我不保證正確性或定義改變，我只能說我不懂之正確定義故查網路查到的定義為如下)：
Alpha characters, more often called alphanumeric, are designed for computers and are comprised of the 26 alphabetic characters and the 10 Arabic numerals. Alpha characters also encompass letter variations for languages other than English.
所以第二小句意為最少需有一個是36(26+10)字母之一，即英文字母及數字。第三小句也有點怪了，既然第二小句已包含數字，第三小句為何又強調要包含至少一個數字? 總之誰寫的? 不合理!

No of password=8
---one alpha(bet) character=referring (a)
---one numeric character=referring (1,2,3,4)
---one special character=referring (#,*,&,$)
Option=something that you can choose to have or do, the freedom to choose what you do, your alternative, your possibility, your choice in this 8 particular situation. As I see it, we have (8-3=5)options remaining needing to be dealt with.ie:-(a); (2); (&); (-); (-); (-); (-); (-);