This states that after five years of hard work, a high-quality textbook was completed, divided into six levels spanning from 4th grade to 9th grade. It describes the development and structure of an educational book.
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。
| Expression | 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。 |
|---|---|
| Meaning | After five years of hard work they presented a high quality textbook, which consisted of six levels from grade4 to grade9. |
| Reading | jīngguò wǔ nián de jiānkǔ gōngzuò tāmen wánchéng le yītào gāozhìliàng de jiàocái gāi shū fēnwéi liù jí cóng xiǎoxué niánjí dào chūzhōng niánjí |
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