喜樂美語
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    aB2

    /ˈɑːpʃənəl/ · /ˈɒpʃənəl/

    If something is optional, you can choose to do or use it, but you do not have to.

    可選的

    比較級 more optional最高級 most optional

    例句逐字對照、搭配詞、易混淆字

    這一義的完整解析還沒打開。訂閱後可以看到例句怎麼拆、常跟哪些字一起出現， 以及容易跟它搞混的字。

    看看訂閱內容

核心畫面

Picture a form where one box has a star and another does not: the starred one you must fill in, the other is yours to leave blank. Optional marks that second box — the door is open, and walking through it is up to you.

可以想成：表格上有些欄位打了星號、有些沒有。打星號的一定要填，沒打的可以留白。optional 標記的就是後者：門是…更多收起可以想成：表格上有些欄位打了星號、有些沒有。打星號的一定要填，沒打的可以留白。optional 標記的就是後者：門是開的，走不走由你。相反的說法是 compulsory（英式，常用於學校科目）或 mandatory / required（正式規定）。

原始詞典資料3 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。

optionaladj/ˈɒp.ʃə.nəl/

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    Not compulsory; left to personal choice; elective.

    • On that beach clothing is entirely optional.
    • Do you need to wear eyeliner? As with any makeup step, eyeliner is completely optional. From an artistic perspective, if you are wearing eyeshadow, I almost always recommend wearing eyeliner, unless your eyelids and eyelashes are obscured by the eyebrow area. Eyeliner is a basic part of an eye-makeup design because it shapes and defines the eyes and makes the eyelashes look thicker.

optionalnoun/ˈɒp.ʃə.nəl/

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    Something that is not compulsory, especially part of an academic course.

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    computingengineeringmathematicsIn various programming languages, a kind of variable that is assigned a specific data type but may or may not hold an actual value.

    • In functional languages, there is a data type called the option type, also called the maybe type. Its purpose is to encapsulate a value, which is returned from a function. […] In Java 8, the Optional class has been added to serve as an option type.

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。