我不知把英语课本丢在哪儿了。

I mislaid my English textbook.

《新英汉大辞典》

学习了初三的英语课本后，我很幸运地认识了许多不同领域的名人。其中，成龙给我留下了最深刻的印象。

After learning the English text books of Junior Three, I'm lucky to get to know many famous people in different fields, among whom, Jackie Chan has impressed me most.

youdao

我们的英语课本有18个单元。

There are 18 units in our English textbook.

youdao

Let's listen to an erhu play a melody by a traditional Chinese composer— we call him in English "Abbing" and you can read about him there in your textbook.

让我们听听一段二胡旋律吧,它由一位中国早年的作曲家创作,英语中我们称呼他Abbing,当然,课本上有他相关的信息

耶鲁公开课 - 聆听音乐课程节选