B (教材) 教材 jiao4cai2
teaching materials
Lehrmittel, Lehrbuch, Kursmaterial

C (講義) 讲义 jiang3yi4
teaching materials/ lecture sheets
Lehrmaterial, Lehrstoff

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Definitions from Unihan Copyright © 1991-2015 Unicode® Inc. All rights reserved.

講 讲 explain / discuss / talk
義 义 right conduct, righteousness

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