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yuetwoh
Can I call Chapter in a text book 章節 or something else?
Just suggestion:
Yes you can. Well, depends on how you want to interpret. Literally, it's wrong. But it's quite awkward to call chapter 章 solely. 節 can act as a complimentary word of 章. Also, you may consider translate it as 篇章.
PS. For [Chapter 1], better to call 第一章 only