libro di testo (zn):
handboek(en) formal manual of instruction.
(zh) 學校指定官方讀本書籍., leerboek(en) formal manual of instruction.
(zh) 學校指定官方讀本書籍., schoolboek(en) formal manual of instruction.
(zh) 學校指定官方讀本書籍., studieboek(en) formal manual of instruction.
(zh) 學校指定官方讀本書籍.
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