1. I always keep track of my expenses in my memorandum book.
我总是把我的开支记录在备忘录本上。

2. The professor wrote down important research ideas in his memorandum book.
教授把重要的研究想法写在备忘录本上。

3. Don't forget to bring your memorandum book to the meeting to take notes.
不要忘记把备忘录本带到会议上记笔记。

4. I like to jot down my thoughts and ideas in my memorandum book.
我喜欢在备忘录本上记下我的思绪和想法。

5. The CEO always carries his memorandum book with him to stay organized.
CEO总是随身携带备忘录本来保持组织性。

6. My grandmother passed down her old memorandum book to me, filled with memories.
我的奶奶把她的旧备忘录本传给我，充满了回忆。