「教科書」

(pos:名詞)(sim:課本)
<explanation>
yue:學校上堂用嘅書，一般會將內容分為一課課，方便學生分辨同理解概念；喺香港，中小學嘅教科書要經過教育局審核，先可以成為認可嘅適用書目（量詞：本）
eng:textbook
<eg>
yue:啲教科書成日改版，無得買二手，個個都逼住要買貴書。 (di1 gaau3 fo1 syu1 seng4 jat6 goi2 baan2, mou5 dak1 maai5 ji6 sau2, go3 go3 dou1 bik1 zyu6 jiu3 maai5 gwai3 syu1.)
eng:Those textbooks are frequently revised, and you can't buy their older versions: everyone has to buy the expensive brand-new copies.