textbook的解释，在云词典中textbook是什么意思？

textbook

['tekstbuk]
n.
教科书, 课本
adj.
合乎规范的

A textbook of reading exercises.
阅读练习内容为阅读练习的教科书
After five years of hard work they presented a high quality textbook, which consisted of six levels from grade4 to grade9.
经过五年的艰苦工作，他们完成了一套高质量的教材。该书分为六级，从小学4年级到初中3年级。
An elementary textbook for teaching children to read.
识字课本，初级读本教授儿童读书的初级课本
Each student was issued with a textbook.
每个学生发了一本课本。
He must be reeling it in, considering we all have to buy his textbook.
想到我们全都得买他的书时，他一定赚死了。
Our textbook have many figures to help explain the lesson
我们的教科书有许多图表帮助解释课文
Peter hopes that this textbook will be issued as a paperback, as this will increase the sales.
彼得希望这本教科学书以平装书出版，因为这样可以增加销售量。
That old edition won't do for a textbook.
那一老版本作为教科书是不行的。
The compiler agree upon a division of the textbook into twelve units.
编辑者都同意把教科书分成十二个单元。
The editors saw fit to include some illustrations in the textbook.
编辑们认为在课本中加些插图是合适的。