- 1aB2
/ˈmændətɔːri/ · /ˈmændətəri/
required by law or a hard rule — you must do it, and you cannot choose not to.
強制的；法定必須的
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Picture a form with a red beside a field — you cannot submit until it is filled. The word marks the things where choice has been removed by a rule or a law. Its opposite is optional, and holding those two side by side is the fastest way to feel what it means.
可以想成：表格上某個欄位旁邊的紅色星號——沒填就送不出去。這個字標示的是「規定或法律已經把選擇拿掉」的那些事。它的相…更多收起
可以想成：表格上某個欄位旁邊的紅色星號——沒填就送不出去。這個字標示的是「規定或法律已經把選擇拿掉」的那些事。它的相反詞是 optional（可選的），把這兩個字擺在一起看，最快抓到它的份量。它比 necessary 更硬：necessary 是「有需要」，mandatory 是「規定就是這樣」。原始詞典資料4 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
mandatoryadj/ˈmæn.də.t(ə)ɹi/
- 1
obligatory; required or commanded by authority.
- Attendance at a school is usually mandatory for children.
- This kind of immediate control structure we take to be characteristic of the tribe, and it leads to a rather rigid type of system in which 'every action not mandatory is forbidden'.
- 2
Of, being or relating to a mandate.
- Mandatory Palestine
mandatorynoun/ˈmæn.də.t(ə)ɹi/
- 1
A sign or line that require the path of the disc to be above, below or to one side of it.
- 2
datedrareA person, organisation or state who receives a mandate; a mandatary.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。