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Instructional means “made to teach.” An instructional video shows you how to do something. Instructional materials are the books, sheets, and clips a teacher uses. It is a school-and-training word, a bit dry and official — the kind you see on a course page or a box of classroom tools. It names the job of the thing: its purpose is instruction. It does not mean “I learned a lot from this by chance.” A painful mistake can teach you, but it is not instructional unless someone designed it as a lesson. That other meaning belongs to .
教學用的
組成instruction + -al (of or relating to). Instruction comes from Latin instruo, to build knowledge in: in- (in) + struo (to build, to pile up).
同家族的字
- instructionthe noun: the teaching, or the directions
- instructthe verb: to teach or to tell someone how
- instructorthe person who instructs
- instructiveclose in look, different in job: useful as a lesson, not necessarily made as one
- constructsame Latin struo, to build
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。
instructionaladj
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Intended for purposes of instruction, for teaching.
- The manual might have been instructional had anybody actually taken the time to read it.
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Relating to the teaching profession.
- There are 33 instructional resignations tonight, double the amount at this time last year.
instructionalnoun
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A book, film, etc. intended to instruct.
- On legitimate days off, during the summer, Klam received poolside instructionals in monied femininity from Marcia and her three sisters — “the Jewish Gang of Four.”
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。