Not on the official list. Some things are supposed to be entered in a record kept by a government, a school, a company, or a website — cars, guns, businesses, voters, students, phone numbers, users of an app. If that entry was never made, the thing or the person is unregistered.

Not on不在 the official list官方名冊上。Some things有些東西 are supposed to be entered應該被登記 in a record kept by a government, a school, a company, or a website在政府、學校、公司或網站保存的紀錄裡，cars, guns, businesses, voters, students, phone numbers, users of an app像是車輛、槍枝、企業、選民、學生、電話號碼、應用程式的使用者。If that entry was never made如果從來沒有登記過，the thing or the person這個東西或這個人 is unregistered就是未登記的。

"An unregistered vehicle." "Thousands of unregistered voters." "Unregistered users can read the articles but cannot comment." The word usually points at a problem. Unregistered often means illegal or at least outside the rules: an unregistered gun, an unregistered business, an unregistered clinic. But not always — an unregistered user on a website is doing nothing wrong, they simply have not made an account yet, and an unregistered guest is just someone who has not signed in. So read the situation before you assume blame.

「An unregistered vehicle未登記的車輛。」「Thousands of unregistered voters數千名未登記的選民。」「Unregistered users can read the articles but cannot comment未登記的使用者可以看文章但不能留言。」The word usually points at a problem這個字通常暗示有問題。Unregistered often means這個字常常代表 illegal or at least outside the rules違法，或至少不合規定：an unregistered gun未登記的槍、an unregistered business未登記的公司、an unregistered clinic未登記的診所。But not always但不一定——an unregistered user on a website網站上未登記的使用者 is doing nothing wrong並沒有做錯什麼，they simply have not made an account yet他們只是還沒申請帳號，and an unregistered guest而未登記的訪客 is just someone who has not signed in只是還沒登入的人。So所以，before you assume blame在認定是誰的錯之前，read the situation要先看清楚情況。

It also appears in software, where an unregistered copy of a program is one you have installed but not paid for or activated, and it keeps nagging you about it. That use is a little dated now that everything is a subscription.

It also appears in software這個字也出現在軟體裡，where an unregistered copy of a program一套程式的未登記版本 is one you have installed but not paid for or activated是你安裝了但還沒付費或啟用的，and it keeps nagging you about it而且它會一直提醒你這件事。Now that everything is a subscription現在什麼都是訂閱制了，that use這種用法 is a little dated已經有點過時了。

Note the shape of the word: it is un- plus a past participle, and it describes a state, not an action. If you want the action, use the verb: "I need to register my scooter."

Note注意 the shape of the word這個字的構造：it is un- plus a past participle是un-加過去分詞，and it describes a state, not an action描述的是一種狀態，不是動作。If you want the action如果要講動作，use the verb就要用動詞：「I need to register my scooter我得去登記我的機車。」